Chicago Police are asking for your help as they search for the man behind a violent robbery on the Brown Line. 

The attack happened around 10:40 p.m. Sunday near the Quincy station.

According to police, the suspect followed a man from the train and out of the station down West Adams Street. That's when they say he jumped the man from behind, beat him, then robbed him before running away.

CPD has released surveillance pictures of the man they are looking for. He has a medium to dark complexion and is believed to be around 20-30 years old, and approximately 6 feet tall.

If you have any information that could help lead to his arrest, you are urged to call Area Central Detectives at (312) 747-8380.