Local police are investigating the cause of a ruptured gas pipeline off Indonesia.

They said the leak off Banten province on Monday may have been caused by the anchor of the 50,000-dwt Lumoso Raya (built 2003), according to Detik News.

But no cause has yet been definitively established.

The crew has been questioned.

The vessel was anchored 50 to 100 metres from the pipe, it was reported, the closest of any ship in the area.