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CORONADO, Calif. — A bomb threat prompted the closure of the main gate to Naval Air Station North Island Thursday.

The threat and subsequent investigation prompted authorities to close the entrance at Third Street and Alameda Boulevard before 5:30 a.m., although the gates at First Street and Alameda Boulevard and on Ocean Boulevard remained open.

As of about 7:45 a.m., investigators were still assessing the credibility of the threat, according to a statement from Naval Base Coronado. A Navy spokesman declined to release details on the suspicious activity or the bomb threat.

Sailors who work at Naval Air Station North Island were asked to contact their commands before heading in.