In this photo taken Monday, August 31, 2015, the North Korean male choir performs at the Tchaikovsky Concert Hall in Moscow, Russia. The North Korean National Choir has performed for the first time in the Russian capital, putting on a military-inspired concert, with members of the male choir wearing full military dress. As they sang, a giant screen behind the stage showed scenes of military parades, air shows and North Korea's authoritarian leader, Kim Jong Un. North Korea's ambassador to Russia said Monday evening's concert was part of a new cultural exchange between the two countries. (Photo by Pavel Golovkin/AP Photo)

Protesters gather at Park Strip to demonstrate against Shell oil August 31, 2015 near the Dena’ina Convention Center, in Anchorage, Alaska where US president Barack Obama will deliver a speech. President Barack Obama will attend a glacier conference to deliver a speech designed to dramatically underscore the impact of global warming on the enviroment. (Photo by Jerome Cartillier/AFP Photo)

The TePee wildfire is seen burning at the Manning Bridge as it crosses the Salmon River near Riggins, Idaho, in this U.S. Forest Service picture taken August 29, 2015. An 18-mile (29-km) portion of the Salmon River east of the Oregon border was closed to boating and fishing due to the Tepee Springs fire, which has charred more than 78,000 acres (316 square km) of the Payette National Forest and surrounding timber. (Photo by Don Jaques/Reuters/US Forest Service)

Coco Vandeweghe of the U.S. celebrates after defeating compatriot Sloane Stephens during their match at the U.S. Open Championships tennis tournament in New York, August 31, 2015. (Photo by Lucas Jackson/Reuters)

Ana Ivanovic of Serbia reacts as she plays Dominika Cibulkova of Slovakia during their match on the first day of the 2015 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 31 August 2015. The US Open runs through 13 September, which is a return to a 14-day schedule. (Photo by John G. Mabanglo/EPA)

Combination picture shows the site of the Temple of Bel before (top) and after its apparent destruction in Palmyra, Syria, in this August 27, 2015 and August 31, 2015 handout satellite images provided by UrtheCast, Airbus DS, UNITAR-UNOSAT. The hardline Islamic State group has destroyed part of the ancient temple in Syria's Palmyra city, a group monitoring the conflict said on Sunday. The militants targeted the Temple of Bel, a Roman-era structure in the central desert city, the Syrian Observatory for Human Rights said. (Photo by Reuters/UrtheCast/Airbus DS)

The last first-class luncheon menu from the ill-fated luxury cruise liner, the Titanic, dated August 14, 1912, is seen in this undated handout image courtesy of Lion Heart Autographs. The menu is expected to fetch up to $70,000 in an online auction to be held September 30, a curator said on August 31, 2015. The Titanic sank in the Atlantic Ocean on April 15, 1912 after striking an iceberg during its maiden voyage from Southampton, England, to New York. (Photo by Reuters/Lion Heart Autographs)

Lam Yin-bun, 89, poses with his Japanese military yen of around 110,000, left by his father, at his public housing home in Hong Kong, China June 25, 2015. On August 14, 2015, a group of World War Two survivors in Hong Kong, including Lam, took their 70-year-old fight and demanded Tokyo to convert millions of Japanese military yen issued during the war into usable money. Japan occupied Hong Kong for three years and eight months, during which people were forced to exchange their legal tender into military yen. China will hold a military parade on Thursday to commemorate the 70th anniversary of the surrender of Japan. (Photo by Bobby Yip/Reuters)

School children take shelter under desks during an earthquake simulation exercise at an elementary school in Tokyo September 1, 2015. The annual exercise is held nationwide on the anniversary of the 1923 Great Kanto Earthquake to practise the response to major natural disasters. (Photo by Toru Hanai/Reuters)

School children wearing padded hoods to protect them from falling debris, prepare to evacuate during an earthquake simulation exercise at an elementary school in Tokyo September 1, 2015. (Photo by Toru Hanai/Reuters)

School children take shelter under desks during an earthquake simulation exercise at an elementary school in Tokyo September 1, 2015. (Photo by Toru Hanai/Reuters)

A Palestinian man sits atop the rubble of a house which was destroyed by Israeli troops during an Israeli raid in the West Bank city of Jenin September 1, 2015. At least five Palestinians and an Israeli soldier were wounded during an Israeli raid in the occupied West Bank late on Monday to arrest Islamist militants, Palestinian medical sources and Israeli media said. (Photo by Mohamad Torokman/Reuters)

Traditional Chuka drummers celebrate as they welcome the national athletics team at the Jomo Kenyatta airport in Nairobi, Kenya, September 1, 2015, after they topped the medals table at the recently concluded 15th International Association of Athletics Federations (IAAF) World Championships at the National Stadium in Beijing, China. (Photo by Thomas Mukoya/Reuters)

Kenya's Deputy President William Ruto (C) welcomes the national athletics team at the Jomo Kenyatta airport in Nairobi, September 1, 2015, after they topped the medals table at the recently concluded 15th International Association of Athletics Federations (IAAF) World Championships at the National Stadium in Beijing, China. With him are (L-R) gold medallists Ezekiel Kemboi of men's 3000 metres steeplechase, Julius Yego of men's javelin and silver medallist Helal Kiprop of women's marathon. (Photo by Thomas Mukoya/Reuters)

A Maasai woman in traditional clothing celebrates as she welcomes the national athletics team at the Jomo Kenyatta airport in Nairobi, September 1, 2015, after they topped the medals table at the recently concluded 15th International Association of Athletics Federations (IAAF) World Championships at the National Stadium in Beijing, China. (Photo by Thomas Mukoya/Reuters)

A visitor walks on a glass flooring above Japanese military flags seized by the Chinese People's Liberation Army (PLA) during World War Two, at the Museum of the War of Chinese People's Resistance Against Japanese Aggression, in Beijing, China, September 1, 2015, two days ahead of the commemoration of the 70th anniversary of the end of World War Two. Some 12,000 soldiers will march through Beijing's central Tiananmen Square on Thursday, mostly Chinese but with Russian and a few other foreign contingents, accompanied by tanks and armoured vehicles, as fighter jets scream overhead. (Photo by Kim Kyung-Hoon/Reuters)

Visitors watch an installation depicting a battle between China and Japan during World War Two, at the Museum of the War of Chinese People's Resistance Against Japanese Aggression, in Beijing, China, September 1, 2015, two days ahead of the commemoration of the 70th anniversary of the end of World War Two. (Photo by Kim Kyung-Hoon/Reuters)

A boy stands in front of statutes at the Museum of the War of Chinese People's Resistance Against Japanese Aggression, in Beijing, China, September 1, 2015, two days ahead of the commemoration of the 70th anniversary of the end of World War Two. (Photo by Kim Kyung-Hoon/Reuters)

Workers prepare to put up a People's Action Party (PAP) sign on a street lamp ahead of the general election in Singapore September 1, 2015. Singapore goes to the polls on September 11, more than a year before a deadline for the next election, with the government seen riding the feel-good factor of the wealthy city-state's 50th birthday last month amid slowing economic growth. (Photo by Edgar Su/Reuters)

Visitors run away from a wave caused by a tidal bore which surged past a barrier on the banks of Qiantang River, in Hangzhou, Zhejiang province, China, August 30, 2015. (Photo by Reuters/China Daily)

Central Jakarta police chief Hendro Pandowo stands next to razor wire as Indonesian trade union workers hold a protest outside the Presidential Palace in Jakarta September 1, 2015. Thousands of workers protested on Tuesday against job cuts and called for higher wages, raising pressure on the government as it struggles to kickstart an economy growing at its slowest in six years. (Photo by Reuters/Beawiharta)

A woman street vendor who sells drinks and food walks across the street in Jakarta September 1, 2015. Global economic growth is likely to be weaker than earlier expected, the head of the International Monetary Fund said on Tuesday, due to a slower recovery in advanced economies and a further slowdown in emerging nations. IMF Managing Director Christine Lagarde also warned emerging economies like Indonesia to “be vigilant for spillovers” from China's slowdown, tighter global financial conditions, and the prospects of a U.S. interest rate hike. (Photo by Reuters/Beawiharta)

Thai police spokesman Prawut Thawornsiri shows a sketch of a suspect believed to be involved in the recent Bangkok blast at the Royal Thai Police headquarters in Bangkok, Thailand, September 1, 2015. Thai police have issued arrest warrants for three more foreign male suspects, Prawut said. (Photo by Chaiwat Subprasom/Reuters)

A Hindu activist faints after falling down during a clash with police during a protest rally in Kathmandu, Nepal September 1, 2015. The protesters tried to break through a restricted area near the parliament as they demanded Nepal be declared a Hindu State in the new constitution. (Photo by Navesh Chitrakar/Reuters)

Hindu activists chant slogans near a police line during a protest rally trying to break through a restricted area near the parliament, in Kathmandu, Nepal September 1, 2015. (Photo by Navesh Chitrakar/Reuters)

Nepalese supporters of Hindu religion and police scuffle during a protest rally in Kathmandu, Nepal, 01 September 2015. Hindu supporters from various religious organizations and political parties staged a protest rally demanding Nepal to be declared as a Hindu Nation in the new proposed constitution, which it is scheduled to be announced later this month. The major political parties have agreed to divide the country into seven federal states in a move that has been criticized by ethnic minorities for potentially undermining their political representation. (Photo by Narendra Shrestha/EPA)

Nepalese police arrest a Hindu activist as demonstrators try to break through to a cordoned-off area near parliament during a protest demanding Nepal be declared a Hindu state in Kathmandu on September 1, 2015. Violent protests have erupted in the last few weeks in Nepal after lawmakers struck a breakthrough deal to table the draft of a new constitution, spurred by April's devastating earthquake. (Photo by Prakash Mathema/AFP Photo)

A set of Taiwan metro cards featuring pictures of Japanese p*rn star Yui Hatano is displayed during a news conference in Taipei, Taiwan, August 26, 2015. The Taiwan metro cards featuring pictures of Hatano sold out on Tuesday within hours of going on sale at midnight, the company said. Picture taken August 26, 2015. (Photo by Matt Yu/Reuters)

Protestors carry a Lebanese flag in front of riot police at one of the entrances to the environment ministry in downtown Beirut, Lebanon September 1, 2015. Dozens of protesters occupied the environment ministry in the Lebanese capital Beirut on Tuesday calling on minister Mohamad Al Machnouk to resign over a rubbish disposal crisis, the latest in a wave of protests against the paralysed political system. Hundreds of other protesters gathered outside the building as riot police took up positions in surrounding streets and the “You Stink” anti-government campaign called for a new rally in a nearby square in the afternoon. (Photo by Aziz Taher/Reuters)

Riot police clash with protestors on the environment ministry entrance in downtown Beirut, Lebanon September 1, 2015. (Photo by Mohamed Azakir/Reuters)

Italian model and actress Elisa Sednaoui poses for photographers a day before the 72nd Venice Film Festival in Venice, Italy, September 1, 2015. Sednaoui will be hosting the opening and closing ceremonies of the film festival. (Photo by Stefano Rellandini/Reuters)

Italian actress Elisa Sednaoui arrives by boat at the Lido Beach ahead of the annual Venice Film Festival, in Venice, Italy, 01 September 2015. Sednaoui will host the opening ceremony of the festival. The festival runs from 02 to 12 September 2015. (Photo by Ettore Ferrari/EPA)

A man looks on from the sea as Italian model and actress Elisa Sednaoui poses for photographers a day before the 72nd Venice Film Festival in Venice, Italy, September 1, 2015. (Photo by Stefano Rellandini/Reuters)

A video monitor displaying an image of Sepp Blatter is seen at an exhibit “The «Beautiful Game» Turns Ugly” at The Mob Museum in Las Vegas, Nevada September 1, 2015. A display on FIFA corruption opens at the museum today. (Photo by David Becker/Reuters)

Russian President Vladimir Putin (R) and Washington Capitals winger Alexander Ovechkin (3rd L) take part in a match between former Russian ice hockey stars and students of the Sirius educational centre for gifted children in Sochi, Russia, September 1, 2015. (Photo by Mikhail Klimentyev/Reuters/RIA Novosti/Kremlin)

Russian President Vladimir Putin meets with students of the Sirius educational centre for gifted children in Sochi, Russia, September 1, 2015. (Photo by Mikhail Klimentyev/Reuters/RIA Novosti/Kremlin)

Russian President Vladimir Putin (R) meets with students of the Sirius educational centre for gifted children in Sochi, Russia, September 1, 2015. (Photo by Mikhail Klimentyev/Reuters/RIA Novosti/Kremlin)

Russian President Vladimir Putin (R) poses for a selfie with students at the Sirius educational centre for gifted children in Sochi, Russia, September 1, 2015. (Photo by Mikhail Klimentyev/Reuters/RIA Novosti/Kremlin)

Russian President Vladimir Putin (C) signs autographs as he meets with students at the Sirius educational centre for gifted children in Sochi, Russia, September 1, 2015. (Photo by Mikhail Klimentyev/Reuters/RIA Novosti/Kremlin)

Riot police use water cannons and rubber pellets to disperse anti-government protesters during a peace day demonstration in central Istanbul, Turkey, September 1, 2015. (Photo by Murad Sezer/Reuters)

Ford President of the Americas Joe Hinrichs speaks next to a Raptor pickup truck at the North American International Auto Show in Detroit, Michigan, in this file photo taken January 12, 2015. The U.S. auto industry powered ahead in August, topping sales estimates and shrugging off gyrating stock markets as consumers continued to show their penchant for pickup trucks and SUVs. (Photo by Mark Blinch/Reuters)

A cut-out depicting stock market traders is seen inside Santiago's stock exchange, Chile, September 1, 2015. (Photo by Ivan Alvarado/Reuters)

The director and actor at copy & waste Steffen Klewar (L) and actor Daniel Brunet pose behind a car model of a DeLorean DMC-12 at the concept store “Knick-Knack to the Future” in Berlin, Germany, September 1, 2015. The Berlin-based collective of artists, called copy & waste, selling coffee, cupcakes and “Back to Future”-themed bags, shoes and T-shirts. (Photo by Hannibal Hanschke/Reuters)

Police officers check their weapons before taking off in a helicopter for a manhunt in Fox Lake, Illinois, United States, September 1, 2015. Police with dogs and helicopters are searching woods and swampy areas north of Chicago for three armed suspects after a police officer was shot dead on Tuesday in the suburb of Fox Lake, a local law enforcement official said. (Photo by Jim Young/Reuters)

U.S. Vice President Lyndon Baines Johnson (C) takes the presidential oath of office from Judge Sarah T. Hughes (2nd from L) as President John F. Kennedy's widow first lady Jacqueline Bouvier Kennedy (2nd from R) stands at his side aboard Air Force One at Love Field in Dallas, Texas just two hours after Kennedy was shot in this November 22, 1963 photo by White House photographer Cecil Stoughton provided by the John F. Kennedy Presidential Library in Boston. Attending the swearing in are Assistant Presidential Press Secretary Malcolm Kilduff (L-front), Special Assistant to the President Jack Valenti (L-Rear), U.S. Congressman Albert Thomas (2nd from L-Rear) and U.S. Congressman Jack Brooks (Far R). Love Field airport in Dallas will install a brass plaque to mark the spot where Air Force One sat while Lyndon Johnson was sworn in on the plane as president after the assassination of President John F. Kennedy, officials said on September 1, 2015. (Photo by Cecil Stoughton/Reuters/JFK Library/The White House)

German actor Jo Weil sets a world record in speed-kissing in Cologne, Germany, 01 September 2015. Weil kissed 63 women in 30 seconds. (Photo by Marius BeckerEPA)

Demonstration outside the boutique of Hermes in via Montenapoleone 12 in Milan, against the exploitation of the skin of crocodiles, organized by the Association Cani Sciolti, on 1st September 2015. (Photo by Fotogramma/Splash News)

A woman salvages a mattress from a pile of furnitures left in a street of the popular down town district of Hillbrow on September 1, 2015 following the execution of an eviction order on an occupied building. (Photo by Marco Longari/AFP Photo)

A woman and children walk through flood waters on the Nazim Uddin Road in Dhaka, Bangladesh 01 September 2015. According to local reports many streets have flooded after heavy downpours in the city causing residents to suffer with stagnant rain waters as the drainage and sewage system are overwhelming the poorly maintained infrastructure. (Photo by Abir Abdullah/EPA)

A Filipino resident search for salvageable materials after a dike collapsed in Marikina City, east of Manila, Philippines, 01 September 2015. Local reports said, at least one hundred families were evacuated as scores of houses damaged when heavy rains caused a collapse of a dike nearby. (Photo by Mark R. Cristino/EPA)

Divers work in the Great Barrier Reef exhibit at the Sea Life Aquarium, in Sydney, Australia, 01 September 2015. The Aquarium's divers are taking part in an annual spring clean of the two million litre tank, cleaning out build up organic matter to keep the underwater environment in the best condition for the marine residents. (Photo by Dan Himbrechts/EPA)

President Barack Obama points to a pastry display at the Snow City Cafe in Anchorage, Alaska, Tuesday, September 1, 2015. Obama is on a historic three-day trip to Alaska aimed at showing solidarity with a state often overlooked by Washington, while using its glorious but changing landscape as an urgent call to action on climate change. (Photo by Andrew Harnik/AP Photo)

Russian Prime Minister Dmitry Medvedev visits the museum of the famous Russian poet Sergei Yesenin in the village of Konstantinovo, Ryazan region, 200 km (125 miles) southeast of Moscow, Russia, Tuesday, September 1, 2015. (Photo by Alexander Astafyev/RIA-Novosti, Government Pool Photo via AP Photo)

A policeman stands in front of the sculpture “Bending Man” by Yue Min Jung, during the arrival of German President Joachim Gauck (unseen) at the NRW-Forum in Duesseldorf, Germany, 01 September 2015. Gauck visited the China 8 exhibition of contemporary Chinese art that runs until 13 September. (Photo by Bernd Thissen/EPA)