The Saudi Arabia-owned supertanker hijacked by Somali pirates in a raid several hundred miles out to sea is understood to have anchored off the coast of Somalia.
The Sirius Star, which is fully loaded with crude oil, is understood to be at anchor close to a headland called Raas Cusbad, near Hobyo.
The owner of the ship, Vela International Marine, said the 25 crew members on board were safe.
The company said response teams had been established and were working to ensure the release of the crew and the vessel, which was seized by pirates on Saturday.
The president of the company, Salah Kaaki, said it was working with relevant embassies while awaiting further contact with the pirates.
"Our first and foremost priority is ensuring the safety of the crew. We are in communication with their families and are working towards their safe and speedy return," he said.