LAS VEGAS (AP) — A man sitting at the back of a public bus on the Las Vegas Strip opened fire "for no apparent reason" as passengers got off at a stop in the heart of the tourism corridor, police said. Police have started a hotline seeking to hear what those passengers witnessed. Because authorities did not know if more victims were inside, crisis negotiators, robots and armored vehicles surrounded the bus. Officers swept into casinos to warn tourists to hunker down until further notice, leaving the normally bustling pedestrian areas and a road notorious for taxi-to-taxi traffic completely empty.