Airman 1st Class Spencer Stone, who helped take down a gunman on a train in Belgium, was stabbed four times in the chest in Sacramento early Thursday morning, Air Force Times has learned.

"A1C Spencer Stone has been transported to a local hospital, and is currently being treated for injury," Air Force spokesman Lt. Col. Christopher Karns said in an email in Air Force Times. "The incident is currently under investigation by local law enforcement. He is currently in stable condition."