A mother cradling her son in her arms as his eyes sting with tear gas following an anti-government march in Yemen is the winning photograph in the World Press Photo contest, currently exhibiting at London's Southbank Centre.
Fatima al-Qaws and her son Zayed in the winning photograph
The shot of Fatima al-Qaws and her 18-year-old son Zayed was taken by Samuel Aranda in October last year and heads an extraordinary collection of images showing moments of adversity, tragedy and triumph from around the world.
Other striking images from the diverse collection include Maria, a drug-addicted sex worker from the Ukraine with a bandaged leg, a mud-baked battle on an Irish rugby field and a polar bear climbing a cliff hunting for guillemot eggs.
More than 100,000 pictures were originally submitted by over 5,000 photographers to the prize that aims to showcase the world's best photojournalism from 2011.
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