Haiti was struck by a powerful earthquake on Saturday that buried people in the rubble of collapsed buildings and sent seawater rushing through streets, forcing residents to run for higher ground.
Authorities in the capital Port-au-Prince said at least 304 people were killed and 1,800 injured, but the toll was expected to rise.
“High casualties are probable and the disaster is likely widespread,” the US Geological Survey warned. “Past events with this alert level have required a national or international level response.”