Attendants prepare to walk into the iconic Bird's Nest National Stadium during a rehearsal of medal presentation ceremonies for the upcoming 15th IAAF Athletics World Championships in Beijing Tuesday, Aug. 18, 2015. The sport event will be held in Beijing from August 22 to 30. (Photo by Andy Wong/AP Photo)

Attendants prepare to walk into the stadium during a rehearsal of medal presentation ceremonies in China's National Stadium, known as the Bird's Nest, ahead of the IAAF Athletics World Championships, in Beijing on August 18, 2015. (Photo by Greg Baker/AFP Photo)

In this June 22, 2015, photo, Sprout Pharmaceuticals CEO Cindy Whitehead works in her office in Raleigh, N.C. The Food and Drug Administration on Tuesday, August 18, 2015, approved Sprout Pharmaceutical's first prescription drug designed to boost sexual desire in women, a milestone long sought by a pharmaceutical industry eager to replicate the blockbuster success of impotence drugs for men. (Photo by Allen G. Breed/AP Photo)

Elissa Montanti gives Mwigulu Magesa a kiss as he celebrates his 12th birthday with Emmanuel Rutema, left, Baraka Lusambo, foreground right, Kabula Masanja, second from right, and Pendo Noni, right, in New York on Wednesday, July 1, 2015. The children were attacked and dismembered in the belief that their body parts will bring wealth. (Photo by Julie Jacobson/AP Photo)

A young boy shows emotion as he covers his face while the funeral takes place of former IRA member Kevin McGuigan Sr on August 18, 2015 in Belfast, Northern Ireland. The father of nine was shot dead outside his home in the Short Strand area earlier this week after being told by police he was under threat from republicans. Mr. McGuigan was given the warning shortly after the killing of former IRA commander Gerard Davison in May of this year. Northern Ireland first minister, Peter Robinson, has indicated that Sinn Fein could be expelled from the coalition government if IRA involvement in the killing is proven. Sinn Fein has denied any IRA connection in the killing. The PSNI have warned against possible reprisal attacks on rival republicans over the murder of Mr McGuigan. (Photo by Charles McQuillan/Getty Images)

A migrant walks to a boat to reach the Greek island of Kos on early August 18, 2015 off the shore of Bodrum, southwest Turkey. Authorities on the island of Kos have been so overwhelmed that the government sent a ferry to serve as a temporary centre to issue travel documents to Syrian refugees – among some 7,000 migrants stranded on the island of about 30,000 people. The early hours are the safest time for migrants travelling from Turkey to the Greek islands just across the water, which have seen a huge influx of refugees escaping the civil war in Syria and chaos in Afghanistan since the beginning of this year. (Photo by Bulent Kilic/AFP Photo)

Migrants queue to register with the police authorities in Mytilene on Lesbos island, on August 17, 2015. The European Union pledged to fast-track new funding to help debt-hit Greece cope with a surge in migrants, with hundreds coming ashore daily only to be confronted by often hellish conditions. (Photo by Achilleas Zavallis/AFP Photo)

Bolivian soldiers dressed in the uniforms of the historical Sucre regiment, carry the coffin of one of two bodies of soldiers recovered from Peru, at Sucre airport, Bolivia August 17, 2015. Two Bolivian soldiers killed during the 1880s War of the Pacific were honoured posthumously in a solemn ceremony in Lima, Peru before being repatriated on Monday to Bolivia. The two bodies, identified as a Bolivian officer and a soldier who belonged to the Sucre Second Infantry Regiment, were found in Peru in 2008. Peru's Culture Ministry, the department which conducted the research, said the bodies were practically mummified because of the area's geographical conditions. (Photo by Enrique Quintanilla/Reuters)

August 17, 2015; Bronx, NY, USA; New York Yankees starting pitcher Bryan Mitchell (55) reacts after being hit in the face by a baseball against the Minnesota Twins during the second inning at Yankee Stadium. (Photo by Adam Hunger/USA TODAY Sports)

Oscar Pistorius of South Africa comes out of the starting blocks during his men's 400 metres heat at the IAAF World Championships in Daegu in this August 28, 2011 file photo. Pistorius is due to be released on Friday after serving 10 months of a five-year sentence, in line with South Africa's custodial guidelines for non-dangerous prisoners. (Photo by Max Rossi/Reuters)

Military and police personnel walk past tourists as they patrol near the Grand Palace in Bangkok, Thailand, August 18, 2015. A bomb blast at a popular shrine in Bangkok that killed 22 people including eight foreigners did not match the tactics used by separatist rebels in southern Thailand, the country's army chief said on Tuesday. (Photo by Chaiwat Subprasom/Reuters)

Relatives cry as they remove the body of Suwan Sudmun, a Thai victim of Monday's bomb blast, at the Institute of Forensic Medicine in Bangkok, Thailand, August 18, 2015. (Photo by Chaiwat Subprasom/Reuters)

Relatives react after seeing the body of Yutnarong Singraw, a victim of Monday's bomb blast, at the Institute of Forensic Medicine in Bangkok, Thailand, August 18, 2015. (Photo by Chaiwat Subprasom/Reuters)

Relatives cry near the body of Thai victim Suwan Sudmun after Monday's bomb blast, at the Institute of Forensic Medicine in Bangkok, Thailand, August 18, 2015. (Photo by Chaiwat Subprasom/Reuters)

A soldier walks past tourists near the Grand Palace in Bangkok, Thailand, August 18, 2015. (Photo by Chaiwat Subprasom/Reuters)

People pay tribute to firefighters who died, marking the seventh day since the Tianjin explosions, in a mourning ceremony at Binhai new district, Tianjin, China, August 18, 2015. The death toll has risen to 114, with more than 700 people injured and another 70, mostly fire fighters, still missing. The blasts devastated a large industrial site and nearby residences and sent shockwaves across several kilometres. (Photo by Reuters/China Daily)

Representatives from the police and People's Liberation Army (PLA), marking the seventh day since the Tianjin explosions, pay tribute to the people who died, in a ceremony at Binhai new district, Tianjin, China, August 18, 2015. Hundreds of residents displaced by huge explosions last week in the Chinese port of Tianjin demanded compensation on Monday, as authorities worked to complete a sweep of the blast site for dangerous chemicals. (Photo by Reuters/Stringer)

Engineers of Tianjin environmental monitoring center use a device to check the level of hydrogen cyanide present in the air at a monitoring station observing environmental pollution located within a 3-km (2-mile) exclusion zone from last week's explosion site in Binhai new district in Tianjin, China, August 18, 2015. The explosions late last Wednesday in Tianjin, the world's 10th-busiest port in China's industrial northeast, forced the evacuation of thousands of people after toxic chemicals were detected in the air. More than 700 people were injured and another 70, mostly fire fighters, are still missing. (Photo by Kim Kyung-Hoon/Reuters)

Residents evacuated from their homes after last week's explosions in Binhai new district wear face masks as they take part in a rally demanding government compensation outside the venue of the government officials' news conference in Tianjin, China, August 18, 2015. (Photo by Kim Kyung-Hoon/Reuters)

A paramilitary policeman and a policeman, both wearing masks, stand guard at a location within a 3-km (2-mile) exclusion zone from last week's explosion site in Binhai new district in Tianjin, China, August 18, 2015. (Photo by Kim Kyung-Hoon/Reuters)

Hospital workers hold a moment of silence at a commemoration ceremony for the victims of last week's massive explosions at Binhai new district in Tianjin, China, August 18, 2015. (Photo by Kim Kyung-Hoon/Reuters)

A woman carries a basket as she heads towards her field at Khokana in Lalitpur, Nepal August 18, 2015. (Photo by Navesh Chitrakar/Reuters)

A boy plays as he holds onto a taxi through the flooded banks of river Ganges after a heavy downpour caused the rise in water levels in the river in Allahabad, India August 18, 2015. (Photo by Jitendra Prakash/Reuters)

A trader works on the floor of the New York Stock Exchange shortly after the opening bell in New York, August 18, 2015. The Commerce Department report on Tuesday added to solid payrolls, retail sales and industrial output data in suggesting the economy got off to a strong start in the third quarter. The steady flow of upbeat economic reports has bolstered views that the Federal Reserve will raise interest rates in September. (Photo by Lucas Jackson/Reuters)

A “Battle of Britain” re-enactor smokes during a “Battle of Britain” commemoration event at Biggin Hill in southern England Britain, August 18, 2015. (Photo by Peter Nicholls/Reuters)

A “Battle of Britain” re-enactor reads a newspaper during a “Battle of Britain” commemoration event at Biggin Hill in southern England Britain, August 18, 2015. (Photo by Peter Nicholls/Reuters)

“Battle of Britain” re-enactors smoke during a “Battle of Britain” commemoration event at Biggin Hill in southern England Britain, August 18, 2015. (Photo by Peter Nicholls/Reuters)

A man dressed as “Ronald McDonald”, the McDonald's company mascot, takes part in a protest against labor abuses and poor working conditions, in front of a McDonald's restaurant at Paulista avenue, in Sao Paulo, August 18, 2015. (Photo by Nacho Doce/Reuters)

Men dressed as “Ronald McDonald”, the McDonald's company mascot, take part in a protest against labor abuses and poor working conditions, in front of a McDonald's restaurant at Paulista avenue, in Sao Paulo, August 18, 2015. The poster reads “All of this it's a shame”. (Photo by Nacho Doce/Reuters)

Nicaraguan honor guard members carry the coffin of one of five policemen during a posthumous tribute in Managua, Nicaragua August 18, 2015. The five policemen were killed by a criminal gang last Saturday along Nicaragua's Caribbean coast, according to the National Police. (Photo by Oswaldo Rivas/Reuters)

Policewomen mourn during a posthumous tribute for five policemen in Managua, Nicaragua August 18, 2015. (Photo by Oswaldo Rivas/Reuters)

Bayer Leverkusen's Stefan Kiessling (R) reacts in front of a match official during their Champions League play-off soccer match against Lazio at the Olympic stadium in Rome, Italy August 18, 2015. (Photo by Alessandra Bianchi/Reuters)

Lazio's mascot, a white headed eagle called Olimpia, flies prior to the start of their Champions League play-off soccer match against Bayer Leverkusen at the Olympic stadium in Rome, Italy August 18, 2015. (Photo by Alessandra Bianchi/Reuters)

Lazio's Mauricio and Bayer Leverkusen's Stefan Kiessling (R) react during their Champions League play-off soccer match at the Olympic stadium in Rome, Italy August 18, 2015. (Photo by Alessandra Bianchi/Reuters)

In this November 29, 2008, file photo, an Indian soldier takes cover as the Taj Mahal hotel burns during gun battle between Indian military and militants inside the hotel in Mumbai, India. A Pakistani militant leader with a $10 million bounty on his head over his alleged involvement in the 2008 Mumbai terror attacks now has a new target: A Bollywood film that imagines him being assassinated. (Photo by David Guttenfelder/AP Photo)

A newlywed couple draws a heart shape in the sand during a photo shoot on Sijung Ho beach in North Korea, August 18, 2015. The couple gathered with their friends and family members to have their pictures taken after their wedding ceremony. (Photo by Dita Alangkara/AP Photo)

Japan's All Nippon Airways presents three designs for its Star Wars-themed airplanes during a press conference in Tokyo, Japan on August 18, 2015. ANA, which signed a five-year promotion license contract with the Walt Disney Co. last April, said that the Star Wars flights will feature the movie characters also in the headrest covers, napkins, cups and in-flight decorations. The iconic R2-D2 droid from the original Star Wars movies, as well as the new droid BB-8, which will appear in new movie “Star Wars: The Force Awakens”, will feature on the airplane liveries, and all 6 of the Star Wars films to-date will be included in the in-flight entertainment system. According to ANA, some of the Star Wars-themed jetliners might also operate on international routes. (Photo by Aflo/Splash News)

Jockey Giovanni Atzeni (C) also known as “Tittia” of Siena's city quarter Selva celebrates after winning the Palio della Madonna dell'Assunta horse race with his horse Polonki in Siena, Italy, 17 August 2015. The Palio della Madonna dell'Assunta is held twice each year on July and August and is one of the world's most important horse races. (Photo by Maurizio Degl'innocenti/EPA)

A fossilized footprint of a dinosaur in a quarry in Muenchehagen, Hannover, Germany, 17 August 2015, close to the Steinhuder Lake. The footprints are believed to have been created somewhere between 135 to 145 million years ago and have a diameter of up to 1.20 meters. (Photo by Holger Hollemann/EPA)

A general night view on the volcano Cotopaxi from Quito, Ecuador, early 18 August 2015. Ecuador's president on 15 August imposed a state of emergency in the country over concern that the volcano Cotopaxi might erupt. (Photo by Jose Jacome/EPA)

People exchange their money at a currency exchange booth in Istanbul, Turkey, 18 August 2015. Turkey's central bank held key interest rates steady on 18 August while the lira continued to decline versus major currencies, hitting a record low against the dollar. The bank held the baseline one-week repo rate at 7.5 per cent. The lira reached an all-time low of 2.88 to the US dollar in mid-day trading and fell to 3.18 to the euro. Turkey is considered by many analysts to be a fragile emerging market, vulnerable to external shocks. (Photo by Sedat Suna/EPA)

Local villager carry their goats as they crossing Sindhu river in Kaule Dovan in Sindhupalchwok district, Nepal, 18 August 2015. Villagers and transportation are facing difficulties for their daily travel as river level is rises due to continues rainfall in Nepal. (Photo by Narendra Shrestha/EPA)

A hole in the road following a storm the day before on Fovam square in Budapest, Hungary, 18 August 2015. The storm that hit 17 August brought more rain than the average for the whole month of August. (Photo by Zsolt Szigetvary/EPA)

A hole in the road following a storm the day before on Fovam square in Budapest, Hungary, 18 August 2015. (Photo by Zsolt Szigetvary/EPA)

People take souvenir pictures after carrying out maintenance work on the statue of a quadriga, a chariot drawn by four horses, located on top of the Brandenburg Gate, one of the major landmarks of Berlin, Germany, 18 August 2015. (Photo by Wolfgang Kumm/EPA)

A synchronized swimmer gives an underwater performance with about 20,000 sardines at an aquarium in Seoul's Gangnam Ward, South Korea, 18 August 2015. The performance involving national synchronized swimming team members and professional divers will run until 30 August. (Photo by EPA/Yonhap)

A picture made available on 18 August 2015, shows people having breakfast in beds in an effort to set a new Guinness World Record in Beijing, China, 16 August 2015. A total of 418 people paticipated in the challenge of the record of the most people having breakfast in bed at the same time. (Photo by Lao Cai/EPA)

In this March 27, 2012, photo, Leonard Robinson, dressed as Batman, poses for a photo outside his home, in Owings Mills, Md. Authorities say, Robinson, known for visiting hospitalized children dressed in his Batman costume, died, Sunday, August 16, 2015, in a crash on Interstate 70, in western Maryland. Police say Robinson was checking the engine of his Batmobile while standing in the fast lane of eastbound I-70 Sunday night when the car with hit by a Toyota Camry. The driver of the Camry wasn't injured. (Photo by Jonathan Newton/The Washington Post via AP Photo)

Dancers from the “Legend Lin Dance Theatre” perform the artistic director and choreographer Li-chen Lin's classic works “Hymne aux Fleurs qui Passent, Anthem to the Fading Flowers” during a rehearsal at the National Theater Concert Hall in Taipei, Taiwan, Tuesday, August 18, 2015. “Hymne aux Fleurs Qui Passent” pays tribute to the cycle of the year and the complementary principles of Yin and Yang whose eternal struggle provides the driving force behind the changing of the seasons. (Photo by Chiang Ying-ying/AP Photo)

This handout satellite image released by Eumetsat on August 17, 2015 shows a composite image of Tropical Cyclones Goni and Atsani (formerly Tropical Depressions 16 & 17 respectively). (Photo by AFP Photo)

This handout photo provided by the Israel Antiquities Authority (IAA) shows pottery heads of “pillar” figurines, Jerusalem and other Judean sites. Iron Age II , 8th-6th century BCE. The Museum of the Bible, now under construction in Washington, will feature ancient artifacts and treasures from the Holy Land under a new deal with the Israel Antiquities Authority. (Photo by Israel Antiquities Authority/Meidad Suchowolski via AP Photo)

A man transports a refrigerator in the open trunk of a vintage American car outside Havana, Cuba, Monday, August 17, 2015. (Photo by Ramon Espinosa/AP Photo)