Relatives of those who died in the 2010 earthquake attend a memorial service at the mass grave site in Titanyen, on the outskirts of Port-au-Prince, Haiti, Thursday. Haitians are marking the second anniversary of the devastating 2010 earthquake with church services throughout the country on what is a national holiday of remembrance.
Anti-government protesters rest on their collapsed tent following clashes with the police as they called for the resignation of President Ali Abdullah Saleh in Sanaa, Yemen.
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About a week after the opening ceremony of the 1996 Summer Games in Atlanta, a bomb went off in Centennial Park. Two died and more than 100 were injured, but the games went on.
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Migrants ride on top of a northern bound train toward the U.S.-Mexico border in Oaxaca, southern Mexico, in March. Migrants crossing Mexico to get to the U.S. have increasingly become targets of criminal gangs who kidnap them to obtain ransom money.