New York Times photographer Samuel Aranda has won the 'Photo of the Year' award with this picture of a woman holding a wounded relative during protests against president Saleh in Sanaa, Yemen. The prize-winning entries of World Press Photo Contest 2012, the world's largest annual press photography contest, were announced Feb 10. (Reuters/NYT)

The 1st prize for 'Contemporary Issues' singles category of the 2012 World Press Photo contest has been won by Brent Stirton of South Africa (reportage by Getty Images for Kiev Independent). The photo shows Maria, a drug addict and sex worker, in between clients in a room she rents in Kryvyi Rig, Ukraine. (AP /Getty Images)

The 1st prize for 'Portraits' singles category of the 2012 World Press Photo Contest has been won by Laerke Posselt of Denmark. The photo shows Iranian-born Danish actress Mellica Mehraban in Copenhagen. (AP)

Stephanie Sinclair of National Geographic magazine, has won the first prize in 'Contemporary Issues Stories' with the series 'Child brides: Too young to wed'. Tahani (in pink), who married Majed when she was 6 and he was 25, poses for this portrait with former classmate Ghada, also a child bride, in Hajjah Hajjah, Yemen. (Reuters)

Ray McManus of Ireland, a photographer working for Sportsfile, has won the second prize in 'Sports' singles category with this action picture from a rugby match between Old Belvedere and Blackrock played in heavy rain in Dublin, Ireland. (Reuters)

Vincent Boisot of France (Riva Press for Le Figaro Magazine), has won the 2nd prize in 'Arts and Entertainment' singles category of the contest. The photo shows a model posing in front of tailor stalls in the center of Dakar Senegal. (AP /Vincent Boisot)

Former Egyptian president Hosni Mubarak lies on his bed while being taken to the courtroom for another session of his trial in Cairo, Egypt. The image has won the 3rd place prize in 'People in the News' singles category of the 2012 World Press Photo contest. (AP/Mohammed al-Law)

Tomasz Lazar of Poland has won the second prize in 'People in the News' singles category with this picture of the arrest of protesters during a demonstration against police tactics and income inequality in Harlem, New York City. (Reuters)

Futon bedding is left lying on the bedroom floor of an abandoned home in Okuma, Japan which is less than three miles from the damaged nuclear power plant. This photo, one in a series of 12, won the 3rd place prize in the 'General News Stories' category of the 2012 World Press Photo contest. (AP /David Guttenfelder)

The 1st prize in 'Nature Stories' category of the 2012 World Press Photo contest has been won by Brent Stirton of South Africa (reportage by Getty Images for National Geographic magazine). The photo shows 'Rhino Wars' at a game reserve in Natal. The female rhino survived a brutal dehorning by poachers. (AP/Brent Stirton)

The carcass of a cow decomposes next to a barn at a farm in Naraha, Japan. Farmers across the area had to hastily leave their homes and were unable to evacuate livestock. The photo, one in a series of 12, has won the 3rd place prize in 'General News Stories' category of the contest. (AP/David Guttenfelder for National Geographic Magazine)