Thailand ? The crew of a cargo plane loaded with war weapons from North Korea was ordered today to remain in a Thai prison for 12 days for further investigations, as Thailand remained tightlipped about events leading to the aircraft’s seizure and where it was headed.

Thai authorities reportedly acted on a tip from their American counterparts when they impounded the Ilyushin 76 transport plane Saturday and discovered 35 tons of explosives, rocket-propelled grenades and components for surface-to-air missiles — a violation of United Nations sanctions against North Korea.

Members of the five-man crew — four from Kazakhstan and one from Belarus — were charged Sunday with illegal arms possession and refused bail. Bangkok’s Criminal Court today approved a request from authorities to extend their detention by 12 days for further investigation, said police spokesman Pongsapat Pongjaren.