A woman passes by billboard during a sunny day in Belgrade, Serbia, Saturday, July 18, 2015. Hot weather has set in with temperatures rising up to 38 Celsius (100.4 Fahrenheit) in Belgrade. (Photo by Darko Vojinovic/AP Photo)

In this March 23, 1987 file photo, the body of a Libyan tank driver lies partly buried in the sands of the Sahara Desert, near Quadi-Doum, northern Chad. In the background are two Soviet-made T-55 tanks, abandoned after the forces of Chad's President Hissene Habre overran Libyan forces. Monday, July 20, 2015, Habre will go on trial in Senegal, fulfilling the work of many who say they suffered abuse under his rule. For more than a decade after his overthrow Habre lived freely in Senegal. His easy exile was a symbol of impunity in Africa, living in luxury under house arrest in 2005 until his arrest in 2013. Now his trial is a warning to other African dictators that they may be held accountable in Africa for their actions, say human rights experts. (Photo by Laurent Rebours/AP Photo)

In a photo taken with a fisheye lens, Brazil's Felipe Franca Da Silva celebrates after winning the gold medal in the men's 100m breaststroke final at the Pan Am Games, Friday, July 17, 2015, in Toronto. (Photo by Julio Cortez/AP Photo)

A firefighter stands by a burned shop in the town of Neapoli, southern Greece, Saturday, July 18, 2015. Firefighters were battling 49 fire fronts, mainly in southern Greece and near the Greek capital. Prime Minister Alexis Tsipras said Greece had requested help from his country's army and air force, as well as the European emergency response center, to fight the blazes. (Photo by Petros Karadjias/AP Photo)

A Muslim woman applies lipstick after the Eid al-Fitr prayers marking the end of the Muslim holy month of Ramadan in Hong Kong, Saturday, July 18, 2015. (Photo by Kin Cheung/AP Photo)

A child walk on a dirt road near his home as people nearby paint shacks with white fire retardant paint as part of their contribution to International Nelson Mandela day celebrating former South African president Mandela birth day in the township of Nomzamo , South Africa, Saturday, July 18, 2015. Thousands of South Africans celebrating former South African president Nelson Mandela birthday by giving 67 minutes of their time to help other people. (Photo by Schalk van Zuydam/AP Photo)

A woman drives in front of an advertising billboard for Bulgari watches in northern Tehran, Iran, Saturday, July 18, 2015. While it will likely be months before sanctions on Iran ease, business and political leaders are wasting no time in trying to tap into a large and what they hope will be a lucrative Iranian market. Ads for European cars and luxury goods are starting to reappear in Tehran. American firms, though, have to be much more cautious. Deal or no deal, U.S. sanctions not related to the nuclear program will still be in place and bar most American companies from doing business with Iran. (Photo by Vahid Salemi/AP Photo)

This photo provided by Warner Bros. Pictures shows Elizabeth Debicki as Victoria in Warner Bros. Pictures' action adventure “The Man from U.N.C.L.E.”, a Warner Bros. Pictures release. The movie, directed by Guy Ritchie, opens in U.S. theaters on August 14. (Photo by Daniel Smith/Warner Bros. Pictures via AP Photo)

Ted Odhiambo, who said he used to work in one of the mall's shops, poses while his friend takes a photograph of him in the reopened Westgate Shopping Mall, nearly two years after a terrorist attack there left at least 67 people dead, in the capital Nairobi, Kenya Saturday, July 18, 2015. Hundreds of shoppers thronged through the reopened mall Saturday, following two years of repairs after security forces battled four gunmen from Somalia's al-Qaida-linked al-Shabab militant group there in September 2013. (Photo by Ben Curtis/AP Photo)

People from the Hindu community take part in the annual Ratha Yatra celebration in Sao Paulo, Brazil July 17, 2015. (Photo by Nacho Doce/Reuters)

People from the Hindu community take part in the annual Ratha Yatra celebration in Sao Paulo July 17, 2015. (Photo by Nacho Doce/Reuters)

Riot police man shoot tears gas against Potosi demonstrators during clashes in La Paz, July 17, 2015. Hundreds of demonstrators of Potosi demanded to have a meeting with President Evo Morales to discuss about the industrialization of their region in their fifth day of protest in La Paz, according to local media. (Photo by David Mercado/Reuters)

A miner kicks a can of tear gas shot by riot police, as he holds a Potosi department flag during a protest demanding more resources for his region, in La Paz, Bolivia, Friday, July 17, 2015. Residents in the capital city of Potosi have held a general strike over the past 11 days to pressure the national government to respond to their demands for a better hospital, an operable airport and a cement factory, among other things to revamp the economy. (Photo by Juan Karita/AP Photo)

A student lights a fireworks during clashes with riot policemen in La Paz, July 17, 2015. (Photo by David Mercado/Reuters)

Miners, one wearing a Potosi department flag, launch dynamite sticks, and firecrackers at police during a protest in which Potosi residents are demanding more resources for their region, in La Paz, Bolivia, Friday, July 17, 2015. (Photo by Juan Karita/AP Photo)

A protester is detained by New York Police Department officers during a rally for Eric Garner who was killed one year ago by police in New York July 17, 2015. Family and supporters on Friday marked the anniversary of the police killing of Garner with rallies and vigils demanding police reforms and justice in the controversial case. (Photo by Eduardo Munoz/Reuters)

A protester holds a placard with an image of Eric Garner during his anniversary after being killed one year ago by police in New York July 17, 2015. (Photo by Eduardo Munoz/Reuters)

A protester is detained by New York Police Department officers during a march for Eric Garner's anniversary who was killed one year ago by police in New York July 17, 2015. (Photo by Eduardo Munoz/Reuters)

Pedestrians walk on crosswalk at Abancay Avenue in downtown Lima, July 17, 2015. (Photo by Mariana Bazo/Reuters)

Muslims attend a prayer session on a street near a mosque on Eid al-Fitr, in Shanghai, July 18, 2015. The Eid al-Fitr festival marks the end of the holy Muslim fasting month of Ramadan. (Photo by Aly Song/Reuters)

Fire fighters and locals try to control a fire in a popular district of La Paz, Bolivia July 17, 2015. No injuries were reported according to local media. (Photo by David Mercado/Reuters)

A fire fighter looks at the fire in a popular district of La Paz, July 17, 2015. (Photo by David Mercado/Reuters)

A man walks through Sargassum algae at Gaviota Azul beach in Cancun July 17, 2015. Ninety tons of Sargassum, which releases a pungent smell as it decomposes, has been cleared by authorities. According to some biologists, ocean currents have brought the algae from the Sargasso Sea in the Atlantic Ocean to the coasts of Quintana Roo, local media reported. Gaviota Azul beach is one of the most visited beaches in Cancun. (Photo by Victor Ruiz Garcia/Reuters)

A girl reacts as Indonesian Muslim women working in Hong Kong, pray during Eid al-Fitr at Victoria Park in Hong Kong, China July 18, 2015. (Photo by Tyrone Siu/Reuters)

A demonstrator holds a torch with a skull, inscribed with the acronym of the Honduran Institute of Social Security (IHSS), during a march to demand the resignation of Honduras' President Juan Orlando Hernandez in Tegucigalpa July 17, 2015. Thousands Hondurans poured onto the streets of the capital Tegucigalpa on the eighth Friday in a row to demand the resignation of President Juan Orlando Hernandez over a $200 million corruption scandal at the Honduran Institute of Social Security. (Photo by Jorge Cabrera/Reuters)

A Sri Lankan Muslim father and son stand in front of the sea during morning prayers of Eid al-Fitr celebrations marking the end of Ramadan, the holiest month in the Islamic calendar in Colombo, Sri Lanka July 18, 2015. (Photo by Dinuka Liyanawatte/Reuters)

Children play near a fountain as Nepali Muslims attend a mass prayer during Eid al-Fitr celebrations at a mosque in Kathmandu July 18, 2015. The Eid al-Fitr festival marks the end of the Islamic holy fasting month of Ramadan. (Photo by Navesh Chitrakar/Reuters)

A Nepali Muslim man ties a scarf on his head before attending a mass prayer during Eid al-Fitr celebrations at a mosque in Kathmandu July 18, 2015. (Photo by Navesh Chitrakar/Reuters)

A Muslim boy stands next to the fence as Nepali Muslims attend a mass prayer during Eid al-Fitr celebrations at a mosque in Kathmandu July 18, 2015. (Photo by Navesh Chitrakar/Reuters)

Nepali Muslim women wait to observe the mass prayer during Eid al-Fitr celebrations at a mosque in Kathmandu July 18, 2015. (Photo by Navesh Chitrakar/Reuters)

A man reads the Koranic supplication at the graves of his relatives at a cemetery, on the first day of Eid al-Fitr, which marks the end of the holy month of Ramadan, in Rawalpindi, Pakistan, July 18, 2015. (Photo by Faisal Mahmood/Reuters)

Participants wave as they swim with a portrait of late Chinese Chairman Mao Zedong in the Xiangjiang river, a large branch of the Yangtze River, in Changsha, Hunan province, China, July 18, 2015. A total of 280 residents took part in the event to celebrate the 49th anniversary of Mao swimming in the Yangtze River on July 16, 1966, local media reported. (Photo by Reuters/Stringer)

Muslim children play sack race during Eid-al-Fitr celebration in Taguig city, south of Manila July 18, 2015. (Photo by Romeo Ranoco/Reuters)

A Muslim mother plays sack race during Eid-al-Fitr celebrations in Taguig city, south of Manila July 18, 2015. (Photo by Romeo Ranoco/Reuters)

Police officers mark and register bundles of seized python skins in Linyi, Shandong province, China, July 17, 2015. Local police arrested two man suspected of illegal trading of wildlife products and confiscated over 900 pieces of python skins, local media reported. (Photo by Reuters/Stringer)

Police officers mark and register bundles of seized python skins in Linyi, Shandong province, China, July 17, 2015. (Photo by Reuters/Stringer)

Robots are placed on a desk as participants prepare for the upcoming RoboCup 2015, at an exhibition centre in Hefei, Anhui province, China, July 18, 2015. Over 2,000 people have registered to join the RoboCup in Hefei this year which will be held from July 19 to July 23, local media reported. (Photo by Reuters/Stringer)

A participant tests a robot soccer player as he prepares for the upcoming RoboCup 2015, at an exhibition centre in Hefei, Anhui province, China, July 18, 2015. (Photo by Reuters/Stringer)

Los Angeles county firefighters battle wild land fire call the Pine Fire in Wrightwood, California July 17, 2015. A late night brush fire broke out near the Mountain High ski resort Friday in the hills of the Angeles Forest. The fire has burn over 125 acres as of 1:30am Saturday with no containment. (Photo by Gene Blevins/Reuters)

Air tankers make drops at the North Fire near the Phelan, California July 17, 2015. A fast-moving brush fire in the Southern California foothills overran a packed freeway in a mountain pass on Friday, destroying four structures and torching 20 vehicles as drivers abandoned their cars and scrambled to safety. (Photo by Gene Blevins/Reuters)

Cars get away from the North Fire near Phelan, California July 17, 2015. (Photo by Gene Blevins/Reuters)

A sky crane helicopter makes a water drop at the North Fire near Phelan, California July 17, 2015. (Photo by Gene Blevins/Reuters)

Cars are shown burning on the Interstate 15 freeway in the Cajon Pass, California in the frame grab from KNBC video July 17, 2015. A brush fire burning in foothills north of Los Angeles overran a freeway in a mountain pass on Friday, torching several cars and trucks as drivers scrambled to safety. (Photo by Reuters/NBCLA)

A prison inmate hand crew hikes to a paved road after cutting a hand line around part of the Pine Fire outside of Wrightwood, California, USA, 18 July 2015. The Pine Fire burned over 125 acres. (Photo by Stuart Palley/EPA)

Men look at the site of Friday's suicide car attack at a market in Khan Bani Saad, northeast of Baghdad, July 18, 2015. More than 100 people were killed in the suicide car bombing at the busy market in the Iraqi town on Friday, in one of the deadliest attacks carried out by Islamic State militants since they overran large parts of the country. The blast brought down several buildings in Khan Bani Saad, about 30 km (20 miles) northeast of Baghdad, crushing to death people who were celebrating the end of the Muslim fasting month of Ramadan, police and medics said. (Photo by Ahmed Saad/Reuters)

A man, wearing a T-shirt with an image of Russian President Vladimir Putin, poses for a picture while standing next to the 2018 World Cup trophy during a ceremony to present the trophy to the public in St. Petersburg, Russia, July 18, 2015. Russia will host the 2018 World Cup. The T-shirt reads “The politest of people”. (Photo by Peter Kovalev/Reuters)

Protesters attend a rally against Russia's policy towards Georgia in Tbilisi, Georgia, July 18, 2015. Georgia accused Russia on Monday of violating its sovereignty by placing border markers on the edge of the South Ossetia region, leaving part of an international oil pipeline in territory under Russian control. (Photo by David Mdzinarishvili/Reuters)

Team Sky rider Chris Froome of Britain (R), the overall leader's yellow jersey holder, cycles in the Gorges du Tarn during the 178.5-km (110.9 miles) 14th stage of the 102nd Tour de France cycling race from Rodez to Mende, France, July 18, 2015. (Photo by Eric Gaillard/Reuters)

The publicity caravan lines up for departure prior to the start of the fourteenth stage of the Tour de France cycling race over 178.5 kilometers (110.9 miles) with start in Rodez and finish in Mende, France, Saturday, July 18, 2015. (Photo by Laurent Cipriani/AP Photo)

A photographer takes pictures as he runs behind Britain's Chris Froome, wearing the overall leader's yellow jersey, during the fourteenth stage of the Tour de France cycling race over 178.5 kilometers (110.9 miles) with start in Rodez and finish in Mende, France, Saturday, July 18, 2015. (Photo by Laurent Cipriani/AP Photo)

China's Yujie Sun (L) celebrates with teammates their victory over team Romania in the women's team epee final at the World Fencing Championships in Moscow, Russia, July 18, 2015. (Photo by Maxim Zmeyev/Reuters)

Women pose for cell phone pictures on a beach on the shores of Lake Tanganyika in Burundi's capital Bujumbura as the country awaits next week's presidential elections, July 18, 2015. Opposition politicians have accused Burundi's President Pierre Nkurunziza of violating the constitution by running for a third term and are boycotting the vote due on July 21. Dozens of people have already died in protests in the world's third poorest country which emerged from civil war in 2005. (Photo by Mike Hutchings/Reuters)

A street performer plays with a ball at the Constitution (Syntagma) square near the Parliament building in Athens, Greece July 18, 2015. The Greek government ordered banks to open on Monday, three weeks after they were shut down to prevent the system collapsing under a flood of withdrawals, as Prime Minister Alexis Tsipras looked to the start of new bailout talks next week. (Photo by Ronen Zvulun/Reuters)

Spanish actor and director Antonio Banderas (R) and his girlfriend Nicole Kimpel arrive at the second Premios Platino Ibero-American Film Awards, where he will be awarded with the Premio Platino de Honor (Platinum Award of Honor) for Lifetime Achievement, in Marbella southern Spain, July 18, 2015. (Photo by Jon Nazca/Reuters)

Boca Juniors' Carlos Tevez takes a free kick during their Argentine First Division soccer match against Quilmes in Buenos Aires July 18, 2015. Tevez was officially unveiled on July 13 in a 6.5 million euros ($7.15 million) transfer from Juventus. Thousands of fans of the popular club from the port district of La Boca packed La Bombonera stadium to welcome Tevez home from a decade abroad the day after the team went top of the Argentine league championship. (Photo by Marcos Brindicci/Reuters)

Local residents look through a hole in a damaged multi-storey building, which according to locals was caused by recent shelling, in Avdiivka in Donetsk region, Ukraine, July 18, 2015. (Photo by Maksim Levin/Reuters)

Carl Grether hangs a protest sign while demonstrating against the planned clear cutting of trees outlined in the East Bay Deforestation Plan on the University of California, Berkeley campus, in Berkeley, California July 18, 2015. (Photo by Noah Berger/Reuters)

A member of the Ku Klux Klan gestures as he marches during a rally at the statehouse in Columbia, South Carolina July 18, 2015. A Ku Klux Klan chapter and an African-American group planned overlapping demonstrations on Saturday outside the South Carolina State House, where state officials removed the Confederate battle flag last week. (Photo by Chris Keane/Reuters)

A South Carolina State Trooper yells for protesters to get back after a member of the Ku Klux Klan crashed into a light pole while leaving a rally at the statehouse in Columbia, South Carolina July 18, 2015. (Photo by Chris Keane/Reuters)

A man opposed to the Ku Klux Klan rips a Confederate flag during a rally at the statehouse in Columbia, South Carolina July 18, 2015. (Photo by Chris Keane/Reuters)

Members of the Ku Klux Klan yell as they fly Confederate flags during a rally at the statehouse in Columbia, South Carolina July 18, 2015. (Photo by Chris Keane/Reuters)

Team members put the finishing touches on a a chain reaction machine at the Michigan Science Center, Saturday, July 18, 2015 in Detroit. The team has failed to set a record for building the largest chain reaction machine. The machine activated Saturday included more than a half-million objects, but lead builder Steve Price says some sections failed, which meant there weren't enough completed steps to break the record. Organizers say the current Guinness World Records mark for a Rube Goldberg machine had 300 steps. Price says his machine had between 400 and 500 steps but the number likely fell below 200 with the sections that failed. (Photo by Carlos Osorio/AP Photo)

Zeal team members stand behind an Isaac Newton display, part of the largest chain reaction machine at the Michigan Science Center, Saturday, July 18, 2015 in Detroit. (Photo by Carlos Osorio/AP Photo)

A building on a chain reaction machine collapses during activation at the Michigan Science Center, Saturday, July 18, 2015 in Detroit. (Photo by Carlos Osorio/AP Photo)

Stoke City fans cheer as their team plays the Singapore Selection in the Barclays Asia Trophy soccer match in Singapore, Saturday, July 18, 2015. (Photo by Joseph Nair/AP Photo)

This artist rendering provided by the designers, Evergreen Exhibitions, shows “Spread Your Wings”, part of new high-tech interactive exhibition, “Above and Beyond: The Ultimate Interactive Flight Exhibition”, about the future of flight opening soon at the Smithsonian's National Air and Space Museum in Washington that could serve as an important test case for new technologies to overhaul the museum. (Photo by Evergreen Exhibitions via AP Photo)

Venezuela's Grisbel Lopez performs with the ribbon during individual all-around rhythmic gymnastics competition in the Pan Am Games in Toronto Saturday, July 18, 2015. (Photo by Gregory Bull/AP Photo)

A Nepalese Muslim boy waits for his mother outside a toilet before he offers prayers on Eid al-Fitr at a mosque in Kathmandu, Nepal, Saturday, July 18, 2015. (Photo by Niranjan Shrestha/AP Photo)

A general view at European Wax Center And Wilhelmina Models 2015 Summer Goddess Model Search at W Hollywood on July 18, 2015 in Hollywood, California. (Photo by Charley Gallay/Getty Images for European Wax Center)

A general view at European Wax Center And Wilhelmina Models 2015 Summer Goddess Model Search at W Hollywood on July 18, 2015 in Hollywood, California. (Photo by Charley Gallay/Getty Images for European Wax Center)

A row of newspapers on display including a paper with a photo of Britain's Queen Elizabeth as a child giving a Nazi salute, in a shop, in London, Saturday July 18, 2015. Buckingham Palace has expressed its disappointment with a tabloid newspaper for publishing images of a young Queen Elizabeth II performing a Nazi salute together with her family in 1933, the year Adolf Hitler came to power. The palace took the unusual step of commenting on Saturday's report in The Sun newspaper, which shows the queen – then about 7 years old – at the family home in Balmoral, surrounded by her uncle, mother, and sister. The grainy footage also shows Elizabeth's mother making the salute. (Photo by Tim Ireland/AP Photo)

A young girl kisses a mural showing former South African president Nelson Mandela's face at Katlehong township, 35 km east of Saturday, July 18, 2015. On Mandela Day, people around the world are encouraged to spend at least 67 minutes doing something positive for their communities in honor of the 67 years that the late South African president Nelson Mandela spent fighting for social justice and a free, democratic country. (Photo by Themba Hadebe/AP Photo)