One DEA agent was killed and two other law enforcement officers were injured in a shooting on an Amtrak train at a station Monday morning in Tucson, Arizona. , Tucson Police Chief Chris Magnus said Monday that members of a regional narcotics “alliance” of local and federal authorities were conducting a routine check on a stationary train when a man opened fire. Authorities were detaining another man on the train’s upper deck when the shooter pulled out a handgun. Magnus said: “The suspect, after exchanging rounds with the officers, barricaded himself in the bathroom, which is on the lower level. … Ultimately it was determined that the suspect in the bathroom was, in fact, deceased.” The man who was detained remains in custody; authorities have identified no other suspects.

Cheri Oz, special agent in charge of the DEA’s Phoenix division, confirmed that one Drug Enforcement Administration agent was killed in the exchange, said another agent was in critical condition. A Tucson police officer who rushed to help after hearing shots was stable.

Amtrak said in a statement that the “shooting incident” on the train from Los Angeles occurred at about 7:40 a.m. local time. None of the 137 passengers and 11 crew members, who all evacuated into the station, were reported to have been injured.

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