The Greek manager of a Bahamas-flagged tanker carrying more than 32,000 metric tons of gasoline reported the vessel missing on Monday, Oct 8 after it left Abidjan in the Ivory Coast unexpectedly in the early hours of Saturday, according to Reuters.

The tanker Orfeas, crewed by two Greeks and 22 Filipinos, had been expected to discharge its cargo at Abidjan. However, Grace Management said in a statement that the vessel instead "sailed south without orders or explanation".

"The managers have been trying to contact Orfeas continuously, unfortunately without result," Grace Management said. "Her last known position indicates she may be going towards Lagos, Nigeria."

The incident could be the latest in a spate of attacks on shipping in the Gulf of Guinea. In August pirates attacked a Greek-operated oil tanker with a crew of about 20 off the coast of Togo. They released the ship a few days later after stealing 3,000 tons of fuel.

Grace Management said that it has requested assistance from all relevant authorities and neighboring countries.