Vela International Marine Ltd, a Dubai-based marine company which operates the Saudi-owned Sirius Star, said it was working to secure the release of the supertanker and her crew.
A spokesman for the company said all 25 crew were believed to be safe.
The Saudi-owned vessel was hijacked on Saturday, 450 nautical miles south east of Mombasa.
The large oil tanker is owned by Saudi oil company Aramco but was sailing under a Liberian flag.
The Telegraph (UK)
Earlier, a spokesman for the Foreign Office had confirmed that two of those on board are British but could not give any details of their role on the ship.
US Navy spokesman Lieutenant Nate Christensen, of the 5th Fleet, said: “We don’t know the condition of the crew on board or the nature of the pirates’ demands. In cases like this what we typically see is a demand for money from the ship owners but we haven’t had that yet.
This undated picture made at an unknown location shows the Sirius Star tanker conducting a trial run in South Korea. Somali pirates have hijacked the Saudi-owned oil tanker the Sirius Star off the Kenyan coast, the U.S. Navy said Monday, Nov. 17, 2008. The tanker owned by Saudi oil company Aramco, is 330 meters (1,080 feet), about the length of an aircraft carrier, making it one of the largest ships to sail the seas. It can carry about 2 million barrels of oil. Lt. Nathan Christensen, a spokesman for the U.S. Navy’s 5th Fleet, said the Sirius Star was carrying crude at the time of Saturday’s hijacking, but he did know how much.(AP Photo/ Newsis via Daewoo shipping yards and commissioned )
“We don’t know exactly where they are taking it but we know the town of Eyl is a pirate stronghold.”
Eyl is in the northern Puntland region of Somalia and has become notorious for pirate activity over the past months. Dozens of ships are thought to be being held captive there.
The supertanker is the largest ship to fall victim to pirates, the US Navy said. It is 1,080ft (330m) long and can carry about 2 million barrels of oil.
The hijack, which was the first successful attack so far out at sea, raises fears that international patrols nearer the coast and in the Gulf of Aden will not be enough to protect vital trade routes as pirate gangs become ever more audacious.
The Sirius Star was carrying a cargo of crude oil and had 25 crew members on board when it was attacked.