The men allegedly stole cellphones and money from two people about 6:40 a.m. and 2:30 p.m. Sunday at the California station, 2211 N. California Ave., Chicago police said. After taking their belongings the men left the scene on foot or on the Blue Line train.
About 12:30 a.m. Tuesday, the men robbed a third person at the Logan Square station, 2620 N. Milwaukee Ave., police said.
The men are thought to be between 20 and 25 years old, police said.
Anyone with information is asked to call Area Five detectives at 312-746-7394.