The Nigerian Navy says it has rescued a hijacked offshore oil supply ship but pirates escaped with two crew members from Russia and Nigeria.
It's the second rescue in a week.
On Saturday, the navy recovered an oil tanker in a high seas shootout that killed one of the pirates.
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Six hijackers were arrested but two got away with two crew members, believed to be from India and Pakistani.
The navy said it rescued the French-owned MV Bourbon today, hours after receiving a distress call.
The rescue occurred in the Gulf of Guinea, which in 2013 overtook Somalia to become the world's most hijack-prone area.
The gulf is a major route for shipping oil, which is generally what pirates are after though some kidnap for ransom.