The 36,000–dwt ship (built 1993) hit the headlines last month when Libyan authorities tried to prevent it leaving Al-Sidra with an illegal oil cargo, but it broke a blockade with three gunmen on board, before being brought back to Tripoli by US special forces.

Speaking to Reuters from a detention centre, Pakistani master Mirza Noman Baig, 38, said: “We were in a hostage situation.