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The State Department says two American mariners kidnapped last month off the coast of Nigeria have been released.

Spokeswoman Jen Psaki said Tuesday that the U.S. welcomed the release of the two Americans, but said privacy concerns prevented her from disclosing any details about how they were freed. Two U.S. officials told ABC News that .

U.S. officials earlier identified the two as the captain and chief engineer of the U.S.-flagged C-Retriever offshore supply vessel, an oil tanker.

Nigeria’s navy has rescued at least two hostages this year and reported killing several pirates in counterattacks to prevent ship hijackings.