Police say a court in Thailand has approved a 12-day detention for the crew of a seized plane carrying 35 tons of weapons from North Korea.

Police spokesman Pongsapat Pongjaren said Monday that the Bangkok Criminal Court approved a request by authorities to keep the five-man crew detained for further investigation.

The crew includes four men from Kazakhstan and one from Belarus. They were arrested Saturday when their plane was impounded in Bangkok during a reported refueling stop.

Investigators found 35 tons of war weaponry apparently loaded in North Korea in violation of U.N. sanctions.

Thailand has not disclosed where the plane was headed. Local media has reported it was bound for Sri Lanka or Pakistan.