Hartford (AP) — Connecticut State Police are stymied as they try to identify the man who slashed two passengers in a box-cutter rampage aboard a tour bus on Interstate 95 before he was fatally shot by a trooper in Norwalk.

The man had no identification and was not known to the 20 other passengers on the bus Tuesday night. Hearst Connecticut Media reports that investigators are consulting law enforcement bureaus around the country to determine the identity of the Asian man, who was in his 30s.

He stabbed a man and a woman with a box cutter on a bus headed to the Mohegan Sun casino. The bus pulled over in Norwalk.

Without his name, the state medical examiner's office would not release the cause of death.

Police say the man also was seen cutting himself.