Chicago police have released photos of a man they are seeking over a reported lewd act aboard a CTA train on the North Side.

Police said the act took place in a train car near the 3900 block of North Sheridan Road at 9 p.m. on October 7. They described the man as 30 to 40 years old and approximately 6 feet tall.

People with information may call the police department’s Mass Transit Detectives at 312-745-4447. Anonymous tips can be filed through CPDTIP.com.