One of the Americans who stopped a terror attack on a train in France has been stabbed multiple times in California.

Airman 1st Class Spencer Stone was stabbed four times in the chest early this morning in Sacramento, according to the Air Force Times.

Police released surveillance footage (above) of the attack this afternoon.

An Air Force spokesman said Stone is in stable condition at a local hospital and that police are investigating the attack, which occurred at 12:45am local time.

Early on, investigators did not think Stone would survive and briefly started a homicide investigation. 

Stone, a Sacramento State University senior, and two friends-- National Guardsman Alek Skarlatos and Anthony Sadler-- were on the Amsterdam-to-Paris train in late August when a gunman started to open fire. The three Americans charged the gunman and were able to eventually subdue him.

They recounted their heroic actions in a Kelly File interview last month. 

UPDATE, 2:30p ET: Stone's injuries are described as "very significant," but not life-threatening.

Sacramento police tweeted that the incident was not terror-related and alcohol appears to have been a factor. 

Police are looking for two suspects, described as Asian men driving a Toyota Camry, according to Air Force Times.

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