KUALA LUMPUR, Malaysia (AP) — A Thai tanker carrying diesel failed to make its scheduled arrival at an Indonesian port two days ago and contact with the vessel has been severed, in what may have been a hijacking, a maritime watchdog agency said Saturday.

The International Maritime Bureau said the ship’s owner lost contact with Mt Orapin 4 and its 14 crew members after it left Singapore on Tuesday. It was due at the Indonesian port of Pontianak on Thursday.

Noel Choong, who heads the bureau’s piracy reporting center in Kuala Lumpur, said on Saturday that the ship was classified as missing and a “possible hijack.”

The IMB urged ships to be on the lookout for the missing vessel and for pirates. Last month, a Thai ship and a Singapore tanker carrying diesel were attacked by pirates after they left Singapore. Pirates stole the cargo before releasing the ships.

Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.