World Press Photo, a non-profit organization based in the Netherlands, recently announced the winners of its 2012 photojournalism contest. More than 5,000 photographers from 124 countries submitted over 100,000 pictures to the competition. Top honors this year went to Samuel Aranda for his image of a woman holding a wounded relative during protests in Yemen. The prize-winning photographs will be assembled into an exhibition that will travel to 45 countries over the next year. Below is just a sample of this year's group of winners -- please visit the World Press Photo website to see them all. (See also the winners from 2011.)