CHICAGO (WBBM) – Chicago Police are using video that has just recently surfaced on the Internet to try to solve an assault at a near north side CTA station.

The video shows a young man and an older man exchanging words at the Chicago Avenue Red Line Station. Then the younger man is seen throwing a right uppercut and the older man falls backward to the ground. Then the younger man is seen getting on a train and laughing about the assault with friends, as a woman on the platform went to the man’s aid.

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The assault is believed to have happened in April. Police say they are still trying to find the people involved.

The video can be seen here: