Police are looking for three black men in the St. Louis area after they attacked a white man who refused to talk about the shooting of Michael Brown. The beating was captured by a passenger’s cell phone on one of the city’s MetroLink trains.

The unnamed victim, 43, recounted the story to a local station. He said that one of the men (red shirt) asked to use his cell phone. When he said no, the suspect sat down and asked his opinion on the Michael Brown incident.

The victim said, “I responded I was too tired to think about it right now.”

The video begins just after the angered 20-something stood up and began ranting. Suddenly, he attacks the victim, delivering at least 13 punches to the man’s head. For the entirety of the assault, the victim was seated, protecting his head.

As the train pulled into the station, one of the other suspects joined in the beating. As the doors opened, the main suspect delivered a final kick to the defenseless man before exiting the train.

According to a CNN report, the victim suffered only cuts and bruises to his face and did not request medical attention. He did indicate that he was surprised no one on the train helped:

I think it was disgusting that people were sort of laughing and smiling about it. And no one offered to help. No one seemed to call 911.

However, it was noted that a security guard who witnessed part of the beating called the police.

The train’s surveillance camera captured the faces of the suspects still at large: