A pre-dawn fire raged through an adult video theater in the western Japanese city Osaka, killing at least 15 people and injuring 10 others, officials said Wednesday. Police arrested one of the customers on suspicion of arson and attempted murder, Osaka police spokesman Kengo Hirami said. The suspect admitted to police that he set fire using a stash of newspapers in his bag, CNN reported. The blaze broke out at about 3 a.m. (2 p.m. EDT) in the Cats Adult Video Theater in an entertainment district in Japan's second-largest city, fire department official Yuko Kotani said.