GONAIVES, Haiti (AP) -- Police reinforcements fought bloody battles with gunmen as they tried to retake Haiti's fourth-largest city from rebels who seized it two days earlier in a challenge to President Jean-Bertrand Aristide. At least three police were killed Saturday, and crowds mutilated the corpses. One body was dragged through the street as a man swung at it with a machete. A woman cut off the officer's ear. Another policeman was lynched and stripped to his shorts, and residents dropped a large rock on his corpse.