Riyadh/Nairobi - The owners of a Saudi Arabian oil tanker captured by pirates off the coast of Somalia are negotiating a possible ransom, Saudi Arabia's foreign minister said on Wednesday, according to the Duabai-based al-Arabiya channel.

The Sirius Star, a supertanker owned by the Saudi Arabian firm Vela International that was carrying some 100 million-dollars-worth of crude oil was hijacked Saturday 830 kilometres south-east of the Kenyan coastal city of Mombasa.

Amid reports that the pirates had demanded a ransom, the ship was anchored Tuesday near the Somali port of Harardhere.

Harardhere is around 400 kilometres from the pirate stronghold of Eyl, where the hijackers often take ships and keep international warships at bay by holding crew members hostage.

The ship's 25 crew, who are from Britain, Croatia, the Philippines, Poland and Saudi Arabia, are all safe, Vela International said in a statement on its website. (dpa)