The US military imposed tight restrictions on all personnel in Okinawa on Wednesday, limiting troops to bases, places of work or off-base housing amid a furor over the arrest of a Marine on suspicion of rape. The restriction, which tightens a midnight curfew for enlisted military on the southern Japanese island, started early Wednesday and was indefinite, the US Forces Japan said in a statement. The arrest last week of 38-year-old Staff Sgt. Tyrone Luther Hadnott in the alleged rape of a 14-year-old girl in Okinawa has sparked outrage in Japan, which hosts some 50,000 US troops under a security treaty. Hadnott admitted to investigators that he forced the girl down and kissed her, but said he did not rape her, police said.