A shipping company spokesman says an oil tanker seized by pirates off of Nigeria's coast has been retaken by the country's navy.

Pioneer Ship Management Services LLC spokesman Pat Adamson said a Nigerian navy vessel pulled along the MT Abu Dhabi Star on Wednesday afternoon and took control of the vessel. Adamson said the navy found no pirates on board.

Adamson said the ship's 23 sailors from India were unharmed.

The vessel was attacked Tuesday night off the coast of Lagos. The attack marks the third oil tanker attack in recent days in the Gulf of Guinea, which follows the continent's southward curve from Liberia to Gabon.

Piracy in West Africa has drastically increased in recent years, with pirates increasingly willing to use violence.