Novak Djokovic of Serbia celebrates after victory in his men's singles final match against Rafael Nadal of Spain on the twelfth day of the Australian Open tennis tournament in Melbourne early January 30, 2012. (Photo by Ryan Pierse/AFP Photo)

A police officer guards members of the all-girl punk band “p*ssy Riot” (L-R) Yekaterina Samutsevich, Maria Alyokhina and Nadezhda Tolokonnikova sitting in a glass-walled cage in a court in Moscow, on October 10, 2012. (Photo by Natalia Kolesnikova/AFP Photo)

A supporter of ousted Egyptian president Hosni Mubarak (portrait) waits for news from his trial outside the court in Cairo on February 22, 2012, as the landmark murder and corruption trial of the former leader entered its final day of hearings, with the judge expected to announce the date of the verdict. (Photo by Marco Longari/AFP Photo)

Jamaica's Usain Bolt wins the men's 100m final at the athletics event during the London 2012 Olympic Games on August 5, 2012 in London. (Photo by Adrian Dennis/AFP Photo)

A reveller of Rosas de Ouro samba school starts dancing before participating in the opening night of parades at the Sambadrome, as part of Carnival celebrations in Sao Paulo on February 18, 2012. (Photo by Yasuyoshi Chiba/AFP Photo)

A riot police is engulfed by flames during clashes with protestors in Athens on February 12, 2012. (Photo by Aris Messinis/AFP Photo)

US swimmer Michael Phelps competes in the men's 200m individual medley heats swimming event at the London 2012 Olympic Games on August 1, 2012 in London. (Photo by Francois Xavier Marit/AFP Photo)

Motorists cross a damaged road destroyed at the height of the powerful earthquake in Guihulngan town, Negros Oriental province, central Philippines on February 9, 2012. (Photo by Ted Aljibe/AFP Photo)

Thousands of Congolese flee the town of Sake, 26km west of Goma, following fresh fighting in the eastern Democratic Republic of the Congo town on November 22, 2012. (Photo by Phil Moore/AFP Photo)

France's opposition Socialist Party (PS) candidate for the 2012 French presidential election Francois Hollande (C) receives flour, thrown by a woman (R) while he was signing a pact on French housing crisis with representatives of the Abbé Pierre Foundation on February 1, 2012 in Paris. (Photo by Fred Dufour/AFP Photo)

A man walks past an ice covered car on the frozen waterside promenade at Lake Geneva in the city Versoix, near Geneva on early February 5, 2012. (Photo by Fabrice Coffrini/AFP Photo)

A child looks out from a make-shift tent as under heavy rain during a visit by Under-Secretary General of United Nation for Humanitarian affairs Valery Amos to the refugee camp of Kibati in Goma on August 8, 2012. (Photo by Michele Sibiloni/AFP Photo)

South Korea's Hwang Woojin loses control of his horse Shearwater Oscar during the Show Jumping event of the Modern Pentathlon during the 2012 London Olympics at the Equestrian venue in Greenwich Park, London, on August 11, 2012. (Photo by John MacDougall/AFP Photo)

US President Barack Obama walks to his car upon arriving in Romules, Michigan, on January 26, 2012. (Photo by Jewel Samad/AFP Photo)

Egyptian protesters carry an obelisk with the names of those killed during last year's uprising, at a huge rally in Tahrir Square on January 25, 2012, marking the first anniversary of the uprising that toppled president Hosni Mubarak as a debate raged over whether the rally was a celebration or a second push for change. (Photo by Mahmud Hams/AFP Photo)

Britain's Mohamed Farah celebrates after winning the men's 5000m final at the athletics event of the London 2012 Olympic Games on August 11, 2012 in London. (Photo by Olivier Morin/AFP Photo)

A leopard (Panthera pardus) attacks and wounds Pintu Dey, an Indian labourer in a residential neighbourhood of Silphukhuri area in Guwahati on January 7, 2012. (Photo by AFP Photo/STR)

A fire breather performs in Chinatown in Manila a day before the Chinese New Year on January 22, 2012. (Photo by Noel Celis/AFP Photo)

In this photograph taken on July 10, 2012, a Pakistani worker pulls on a wire he will connect to a thick chain that will in turn be used to peel away a slab of the outer structure of a beached vessel in one of the 127 ship-breaking plots in Geddani, some 40Kms west of Karachi. (Photo by Roberto Schmidt/AFP Photo)

A lonesome motorcyclist rides across the desert during the stage 11 of the Dakar 2012, between Arica and Arequipa, Chile, on January 12, 2012. (Photo by Philippe Desmazes/AFP Photo)

A Palestinian woman is helped by a paramedic out of her building, damaged during an Israeli air raid on a nearby sporting centre in Gaza City November 19, 2012. (Photo by Marco Longari/AFP Photo)

Firefighters of Alcoy and Elda try to extinguish a fire in Torre de Macanes near Alicante, on August 13, 2012. (Photo by Pedro Armestre/AFP Photo)

Palestinian men gather around a crater caused by an Israeli air strike on the al-Dallu family's home in Gaza City on November 18, 2012. (Photo by Marco Longari/AFP Photo)

Jamaica's Usain Bolt celebrates after Jamaica won and set a new world record in the men's 4X100 relay final at the athletics event of the London 2012 Olympic Games on August 11, 2012 in London. (Photo by Adrian Dennis/AFP Photo)

A fire ball rises as the Israeli air force carries out a raid over Gaza City on November 17, 2012, for the fourth consecutive day. (Photo by Majdi Fathi/AFP Photo)

A boy swims amongst the debris as he tries to salvage belongings from destroyed homes hit after two barges smashed into an informal settler area in Manila on July 30, 2012, when strong winds and rains due to Tropical Storm Saola hit the capital. (Photo by Ted Aljibe/AFP Photo)

Palestinians extinguish fire from the car of Ahmed Jaabari, head of the military wing of the Hamas movement, the Ezzedin Qassam Brigades, after it was hit by an Israeli air strike in Gaza City on November 14, 2012. (Photo by Mahmud Hams/AFP Photo)

US swimmer Michael Phelps competes in the men's 200m butterfly heats swimming event at the London 2012 Olympic Games at the Olympic Park in London on July 30, 2012. (Photo by Leon Neal/AFP Photo)

North Koreans pay their respects in front of two portraits, one of founding leader Kim Il-Sung (L) and the other of his son Kim Jong-Il in Pyongyang on April 9, 2012. (Photo by Pedro Ugarte/AFP Photo)

US President Barack Obama does pushups during backetball shooting drills during the annual Easter Egg Roll on the South Lawn of the White House April 9, 2012 in Washington, DC. (Photo by Brendan Smialowski/AFP Photo)

A student arrested by the police during a protest on the street of Montreal's downtown during Formula 1 celebration June 8, 2012. (Photo by Steeve Duguay/AFP Photo)

Syrian rebels hunt for snipers after attacking the municipality building in the city center of Selehattin, near Aleppo, on July 23, 2012, during fights between rebels and Syrian troops. (Photo by Bulent Kilic/AFP Photo)