TAMPA, Fla. (AP) — Tampa police blockaded a neighborhood and searched with a SWAT team and dogs for a possible serial killer Tuesday after a fourth person was shot dead for no apparent reason.

THORNTON, Colo. (AP) — A man suspected of walking into a suburban Denver Walmart and immediately opening fire with a handgun, killing two men and a woman, was arrested Thursday, about 14 hours after fleeing the store.