Los Angeles -- Whatever it was, it didn't represent a threat to the United States.
That's according to a statement from the North American Aerospace Defense Command, or NORAD, about what appeared to be a missile launched yesterday off the coast of Southern California.
The agency says there was no launch by any foreign military.
U.S. military officials say they're looking into a video that appears to show an object shooting across the sky and leaving a large vapor trail. The video was posted on the CBS News website.
A Pentagon spokesman says nobody has been able to explain what the vapor trail is, or what caused it. He says "all indications" are that the Defense Department wasn't involved, and that it might have been created by something flown by a private company.
Missile tests are common off Southern California, from vessels and platforms. Normally, they would require notification so mariners and pilots could be warned.