A sailor was shot and killed by a civilian aboard the USS Mahan, a destroyer, at Naval Station Norfolk in Virginia late Monday night. Security forces shot and killed the suspect, and the incident is now under investigation.
Military spokespersons are keeping pretty mum so far, and there is no word yet on whether or not the civilian was authorized to be aboard the ship. Both the victim and the suspect were male. The naval station was briefly put on lockdown, but that has apparently been lifted.
Here's the link to what the AP has so far. It'll probably be updated as the day goes on.