Japan is urging the US military to tighten discipline and enforce its midnight curfew for marines stationed in Okinawa after more marines were arrested on suspicion of drunken driving during the discipline period. Defense Minister Shinjiro Koizumi says Tokyo has formally demanded effective measures to prevent further incidents, with Japanese and US officials holding talks on stronger enforcement and additional preventive measures. The incident comes days after Japanese prosecutors indicted another Marine on charges of robbery and murder for killing a 39-year-old woman in Naha. Follow: