HARTFORD, Conn. (AP) - An investigation by the Navy's inspector general for the Atlantic submarine force has found that allegations of widespread cheating on exams are unsubstantiated.

The Navy opened an inquiry in August following a review that originated in Groton, Conn., the home port of an attack submarine that was hit by a cheating scandal in 2010.

The commander of the Atlantic submarine force recommended that the case be closed as unsubstantiated with no further action in a letter to U.S. Fleet Forces Command. A copy of the letter was obtained Thursday by The Associated Press through a Freedom of Information Act request.

The report said previous episodes of cheating on submarines were thoroughly investigated and dealt with individually.

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