A number of Carnival celebrants were killed in Port-au-Prince, Haiti, after several individuals on a float were electrocuted by a power line, triggering a panic in which others were trampled. The Associated Press says at least 20 have died; Reuters says it's at least 18, and CNN says at least 12. From the AP:
Video from the scene shows sparks coursing from the wire after a singer from the Haitian hip-hop group Barikad Crew was touched by an overhead power line as the float passed beneath it. The wire appeared to have electrocuted several others as well.