CHICAGO (CBS) — Chicago police have released photos of six suspects wanted in connection with a robbery and aggravated battery on a CTA Red Line Train, at the Roosevelt Road station.

This incident occurred on Dec. 29 at approximately 6:40 p.m. The offenders approached the victims, beat them, and then robbed them, police said.

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Here are the pictures of four women and two men wanted in connection with the alleged crime.

Red Line supects.

Red Line supects.

Red Line supects.

A pregnant woman told police that she and a friend were attacked by a group on a train, near the Roosevelt stop.

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The 28-year-old woman told officers that she and her friend, a 23-year-old woman, were on the train near the Roosevelt stop when a mixed-gender group of assailant got on.

One female assailant got into a quarrel with the older woman, while a second assailant hit the woman in the back of the head and caused her to fall, police said. The assailants kicked and stomped on the woman’s back and rib area, and then ran off, police said.

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The victim was taken to Mercy Hospital with bruised ribs. She also said some of her personal belongings were missing, police said.