According to the police, the incident followed a fight in the metro between the suspect and two other travelers. In the aircraft there would have been already pushed and drawn. One of the victims would then have been pushed out of the metro.
The platform was then continued. One of the victims who hit the man in the face became unconscious. Then the suspect also hit another man in his face. Both moments are recorded on surveillance cameras. Those images have now been shared by the police.
The face of the suspect can be seen on those images. The police hope for tips from people who think they recognize him.