A sailor assigned to aircraft carrier USS Carl Vinson (CVN 70) was discovered unresponsive on board the ship Sunday, the U.S. Navy said in a news release.

There were no details about the circumstances of the death. An investigation is underway, but there were no indications of suicide or foul play, the release said.

The ship was docked at Naval Air Station North Island, Calif. Navy Region Southwest Federal Fire Department responded to the scene and pronounced the sailor dead.

The identity of the sailor will not be released until 24 hours after next of kin have been notified in accordance with Department of Defense policy.

The aircraft carrier USS Carl Vinson sails in the South China Sea, Sept. 7, 2021. (Richard Cho/U.S. Navy)