The shooting stemmed from an argument between two men on the train who were waiting to go to the restroom, according to the Fort Worth Police Department.

Fort Worth police are investigating a reported shooting on a TRE train at the Fort Worth Central Station downtown at 1001 Jones St. A 911 call was received shortly after 11 a.m. It’s unclear whether anyone was injured or whether a suspect has been arrested. Video taken by a witness appeared to show medics treating at least one patient at the scene.

Fort Worth police were contacted by TRE about 11 a.m. that a man on the train with a firearm was causing a disturbance.