NEW ORLEANS — Mayor Ray Nagin ordered 1,500 police officers to leave their search-and-rescue mission last night and return to the streets to stop looting that has turned increasingly hostile as the city plunges deeper into chaos. "They are starting to get closer to heavily populated areas — hotels, hospitals — and we're going to stop it right now," Nagin said. The number of officers called off the search-and-rescue mission amounts to virtually the entire police force in New Orleans. The out-of-control thievery had escalated while cops joined National Guardsmen in focusing on saving lives. In some cases, New Orleans...