Kuala Lumpur: A Thai oil tanker carrying diesel fuel went missing after it departed from Singapore on its way to Indonesia, an international anti-piracy watch group reported on Saturday.

The MT Orapin 4 lost contact with its owner after leaving port on May 27 en route to Indonesia's Kalimantan province, the International Maritime Bureau said.

"All we know at this time is it that it has gone missing," bureau spokesman Noel Choong said when asked whether it was hijacked by pirates active in south-east Asian waters. "We learnt about the incident on Tuesday." The ship had a crew of 14 aboard.