Firefighters work to extinguish fire following rocket attacks by Shiite rebels known as Houthis at storage tanks of an oil refinery in the port city of Aden, Yemen, Tuesday, July 14, 2015. Yemeni forces battling the Shiite rebels in the country's south said they took control on Tuesday of the airport in the strategic port city of Aden, driving the rebels there into the part of the city jutting out into the sea. (Photo by Abo Muhammed/AP Photo)

Doris Hardin talks on the phone as she takes a break from looking for her missing cats and other belongings from her trailer which was swept away after deadly flooding in Flat Gap, Ky., Tuesday, July 14, 2015. Flash floods in northern Johnson County outside of Paintsville destroyed homes and vehicles and residents were reported missing a day after the floods. (Photo by David Stephenson/AP Photo)

Roland Marcum, left, and Frankie Staton look for Marcum's brother-in-law Scott Johnson under the debris of Marcum's father-in-law's mobile home after deadly flooding in Flat Gap, Ky., Wednesday, July 15, 2015. Family members have been looking for Johnson after he helped saved the lives of four family members but went missing during flash floods in northern Johnson County outside of Paintsville. (Photo by David Stephenson/AP Photo)

Migrants from Pakistan pray shortly after their arrival on a dinghy from the Turkish coasts to the Greek island of Kos, Wednesday, July 15, 2015. Tens of thousands of migrants have arrived in Greece so far this year, usually on Aegean islands from the nearby Turkish coast, overwhelming local authorities. Aid groups say Greece urgently needs more help from the European Union to deal with the influx. (Photo by Santi Palacios/AP Photo)

A model adjust her hair as she waits for the audition of the upcoming Lakme Fashion Week in Mumbai, India, Wednesday, July 15, 2015. The event is scheduled to begin August 26 in Mumbai. (Photo by Rafiq Maqbool/AP Photo)

A model does her makeup as she waits for the audition of the upcoming Lakme Fashion Week in Mumbai, India, Wednesday, July 15, 2015. (Photo by Rafiq Maqbool/AP Photo)

Fitness coach Peter Yeoman swims in the pool of Gravity health and fitness club in Singapore's central business district (CBD) July 15, 2015. The S$9.5 million($7 million) luxury gym opened by British-based fitness chain Fitness First, which sits on top of an office building in the CBD, is targeted at C-Suite executives and membership is offered by invitation only to 999 people, according to the club's press release. (Photo by Edgar Su/Reuters)

Golf Shoes are used as flower pots outside an office building in St. Andrews, Scotland, July 15, 2015. The Open, the oldest of four major championships in professional golf,is being held in the town this year. (Photo by Eddie Keogh/Reuters)

Participants play “Bubble soccer” during lunchtime on Boston Common in Boston, Massachusetts July 14, 2015. Organizers say “Bubble soccer” which is played like soccer with full contact between players wearing large air filled plastic bubbles, is a way to reduce stress during the lunch hour. (Photo by Brian Snyder/Reuters)

Team Sky rider Chris Froome of Britain (R), race leader's yellow jersey, cycles along the Tourmalet pass during the 188-km (116.8 miles) 11th stage of the 102nd Tour de France cycling race from Pau to Cauterets in the French Pyrenees mountains, France, July 15, 2015. (Photo by Eric Gaillard/Reuters)

A man stands in front of a photographic drawing he appears in called “Perspective Should be Reversed”, by British artist David Hockney at a preview of Hockney's exhibition “Painting and Photography” at the L.A. Louver gallery in Venice, Los Angeles, California, United States July 15, 2015. (Photo by Lucy Nicholson/Reuters)

A woman walks past photographic drawing “A Bigger Card Players” (R) and painting “Card Players #3” by British artist David Hockney at a preview of Hockney's exhibition “Painting and Photography” at the L.A. Louver gallery in Venice, Los Angeles, California, United States July 15, 2015. (Photo by Lucy Nicholson/Reuters)

A rescue worker tries to remove a trapped car from a flooded river in Chongqing Municipality, July 15, 2015. According to local media, more than ten vehicles fell into the river in a landslide caused by a heavy rainfall on Tuesday. (Photo by Reuters/Stringer)

Rescuers row a wooden boat through a flooded neighborhood in Songtao county in southwestern China's Guizhou province Wednesday, July 15, 2015. Torrential rains hit parts of southwestern China late Tuesday and caused flooding. (Photo by Chinatopix Via AP Photo)

Smoke rises from the Skatestraum tunnel, after a gasoline trailer carrying around 16,000 liters of gasoline exploded inside the tunnel, in Bremanger, Norway July 15, 2015. (Photo by Daniel Restad/Reuters/NTB Scanpix)

Members of the Russian honor guard perform a ceremonial change-over at the Military Glory hall of the Mamayev Kurgan (Mamayev Hill) World War Two memorial complex in the city of Volgograd, Russia, July 15, 2015. (Photo by Maxim Shemetov/Reuters)

Riot policemen try to avoid an exploding petrol bomb during clashes in Athens, Greece July 15, 2015. (Photo by Yannis Behrakis/Reuters)

A protester bleeds as he is arrested by riot police following clashes in Athens, Greece July 15, 2015. (Photo by Yannis Behrakis/Reuters)

A new close-up image of a region near Pluto's equator reveals a range of youthful mountains rising as high as 11,000 feet (3,500 meters) above the surface of the icy body, in a picture released by NASA in Laurel, Maryland July 15, 2015. (Photo by Reuters/NASA New Horizons)

Pitbull performs onstage during Univision's Premios Juventud 2015 rehearsal at Bank United Center on July 15, 2015 in Miami, Florida. (Photo by John Parra/Getty Images For Univision)

Scott Jurek, who claimed the title of quickest trek of the 2,180-mile (3,508-km) Appalachian trail from Georgia to Maine, is shown during his hike in this photo released to Reuters on July 14, 2015. It required running at night on rock-strewn slopes, then sleeping as little as an hour before resuming the daily pace of 47 miles (76 km) that would shatter the record for the fastest-ever completion of the Appalachian Trail. (Photo by Luis Escobar/Reuters)

Argentina's President Cristina Fernandez de Kirchner and her Bolivian counterpart Evo Morales smile as they wear typical Bolivian hats during a ceremony outside the Casa Rosada Presidential Palace in Buenos Aires, July 15, 2015. (Photo by Marcos Brindicci/Reuters)

People work in the rain on their sandcastles and sculptures during the “NJ Sandcastle Contest”, contest in Belmar, N.J., Wednesday, July 15, 2015. After nearby lightning strikes during a steady rain, the beach patrol stopped the competition and asked everyone to leave the beach. (Photo by Mel Evans/AP Photo)

A receptionist dinosaur robot performs at the new robot hotel, aptly called Henn na Hotel or Weird Hotel, in Sasebo, southwestern Japan, Wednesday, July 15, 2015. From the receptionist that does the check-in and check-out to the porter that’s a stand-on-wheels taking luggage up to the room, the hotel, that is run as part of Huis Ten Bosch amusement park, is “manned” almost totally by robots to save labor costs. (Photo by Shizuo Kambayashi/AP Photo)

Two receptionist robots, left, greet a hotel employee demonstrating how to check in the new hotel, aptly called Henn na Hotel or Weird Hotel, in Sasebo, southwestern Japan, Wednesday, July 15, 2015. (Photo by Shizuo Kambayashi/AP Photo)

Pensioner Anna Kousoula, 60, displays her empty refrigerator, as she complains because she can not withdraw her pension from the bank due to capital controls, at the kitchen of her home in Perama, near Athens, Greece July 15, 2015. Anna gets 300 euros as a widow's pension and with this small pension helps her son Stratos, who is unemployed for more than four years. Debate on reforms that are key to a preliminary agreement with creditors to keep Greece out of bankruptcy began in the country's legislature, but fissures were already beginning to show among the ruling SYRIZA party. (Photo by Yannis Kolesidis/EPA)

People mourn during a funeral service for 17 people whose remains have been found in a mass grave and identified through the DNA method, during a memorial service marking the 41st anniversary of the military coup in Cyprus, held for those killed during the uprising, at Sofia tou Theou Church, in Nicosia, Cyprus, July 15, 2015. In 1974, after clashes between the Greek Cypriot and Turkish Cypriot communities, Greek Cypriot nationalists and a Greek military junta attempted to unify the country with Greece. In response, Turkey invaded the northern part of the island, resulting in a partition which still continues. (Photo by Katia Christodoulou/EPA)

Toni Roth flies with his microlight aircraft over a field at the airfield in Schaffhausen, Switzerland, July 15, 2015. After a ban over 30 years, microlights are allowed to take off again in Switzerland. (Photo by Ennio Leanza/EPA)

An Indonesian man makes “ketupat”, traditional rice cooked in coconut leaf casings at a local market in Jakarta, Indonesia, 15 July 2015. Muslims around the world are preparing for Eid Al-Fitr expected to fall this week, marking the end of Ramadhan. (Photo by Bagus Indahono/EPA)

A Malaysian Muslim vendor cooks lemang, glutinous rice stuffed in bamboo sticks and cooked over a charcoal fire, ahead of the Eid Al-Fitr celebrations in Kuala Lumpur, Malaysia, Wednesday, July 15, 2015. The Eid Al-Fitr, one of the holiest religious practices, is celebrated with prayers and family reunions and other festivities among Muslims all over the world. (Photo by Joshua Paul/AP Photo)

A Ukrainian serviceman of the volunteers battalion Kyiv-2 reads a book at their position near Krymske village of Lugansk area, Ukraine, 14 July 2015. The conflict in Ukraine is taking an increasing toll on its citizens with nearly one in nine people needing humanitarian assistance, the UN emergency aid office said 10 July, in Geneva. Among the 5 million Ukrainians in need of help, those living near the battle lines and in areas controlled by pro-Russian separatists have been suffering the most, said Jens Laerke, spokesman for the UN Office for the Coordination of Humanitarian Affairs. (Photo by Ivan Boberskyy/EPA)

Tourists walk to visit an ice cave next to insulating foams wrapping up the Rhone Glacier which has been shrinking under the summer sun on July 14, 2015 near Gletsch. A second heat wave is forecast to hit Switzerland in the next few days. (Photo by Fabrice Coffrini/AFP Photo)

Tourists visit an ice cave inside the Rhone Glacier protected with insulating foams on July 14, 2015 near Gletsch. (Photo by Fabrice Coffrini/AFP Photo)

Dominican Republic's Veronica Saladin Tolentino celebrates after a successful lift attempt during the women's +75kg weightlifting competition at the Pan Am Games in Oshawa, Ontario, Wednesday, July 15, 2015. (Photo by Felipe Dana/AP Photo)

Schoolboys walk next to a graffiti reading “Military intervention never more” at the 13 Commune shantytown in Medellin, Antioquia department, Colombia on July 15, 2015. In 2002, Medellin was rocked by violence after the government's decision to recover part of the city disputed by right-wing paramilitaries and militias, during which, dozens of people were killed, more than 100 people were injured, 98 went missing and 200 families were displaced. Colombian prosecutors, will begin next July 27, the search for the bodies disappeared during the war conflicts in the area called “La Escombrera” – at the 13 Commune – where one of the largest mass graves is believed to be, the government said. (Photo by Raul Arboleda/AFP Photo)

“Airborne” of the Detroit Pistons Flight Crew goes heels over head during a high flying basketball dunking show for the amazed fans at the 33rd Annual Metro Detroit Youth Day on Belle Isle in Detroit, Wednesday, July 15, 2015. (Photo by Daniel Mears/Detroit News via AP Photo)

French adventurer and researcher Stephane Rousson (R) and his team get ready for the first test of “Nemo”, a three-metre long submarine with electric propulsion, on July 15, 2015 in Villefranche-sur-Mer, southeastern France. (Photo by Valery Hache/AFP Photo)

French adventurer and researcher Stephane Rousson gets ready for the first test of “Nemo”, a three-metre long submarine with electric propulsion, on July 15, 2015 in Villefranche-sur-Mer, southeastern France. (Photo by Valery Hache/AFP Photo)