All crew members are safe and no ransom was paid for the release of the cargo vessel, which was reported "missing" on the evening of February 1 from the Contonou anchorage in the Gulf of Guinea, they said.
"I am happy to inform that Merchant Ship Marine Express with 22 Indian nationals on-board has been released," External Affairs Minister Sushma Swaraj tweeted.
She also thanked the governments of Nigeria and Benin for their help and support in securing the release of the freighter and its crew. Swaraj had spoken to her Nigerian counterpart yesterday, seeking assistance in tracing the ship.
All the crew members will be disembarking at the ship's next port of call.
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The Panama-flagged vessel's location during the period of the captivity was not known, but thanks to the "coordinated efforts", she is now in international waters, sailing away from land to her next port of call, it said.
The DGS statement said the pirates disembarked from the vessel without making any demand for ransom or selling off the 13,500 tonnes of gasoline it contained.
In a Facebook post, Anglo Eastern, the ship manning agent, the company that was acting as an employment agency for seafarers on board the ship, said the vessel was the subject of a "pirate attack and seizure". It confirmed the safe release of the crew and the ship.
There had been a few incidents where pirates had let off hijacked vessels and crew after siphoning off the on-board cargo without demanding any ransom.
After the freighter was seized, DGS officials were in contact with the Indian mission in Nigeria, which was coordinating rescue efforts with local agencies.
MT Marine Express had gone missing less than a month after another vessel, 'MT Barret', disappeared off the coast of Benin in January, and was later confirmed to have been hijacked.
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