05/17/2012 02:47 pm ET

Guardian Angels Stabbing: Police Release Surveillance Photos Of Suspects (VIDEO)

Police have released photos of two suspects in the CTA Red Line robbery where four members of a volunteer community patrol group were stabbed.

Four members of the Guardian Angels, who identify themselves with red berets, were stabbed Tuesday evening while intervening in an armed robbery at the Clark and Division Red Line stop.

Police say that a man armed with a handgun hit a 27-year-old male train passenger several times with his gun and snatched his iPhone around 11:13 p.m. on the station's platform, the Chicago Sun-Times reports.

Four Guardian Angels waiting on the platform to board the train witnessed the attack. One Angel grabbed the robber's arm, but he was able to break away and head toward the station turnstile. There, three other Angels took down the robber, but a male accomplice approached them from behind, pulled out a knife and hit and stabbed them.

The suspects' faces were captured by a security camera on the platform, and police have released the photos in the hopes of generating information that will lead to an arrest, according to ABC Chicago.

The men were wounded on their arms, and one also sustained an injury to his head, according to NBC. One Angel's injuries required 17 stitches before all four were released from Northwestern Memorial Hospital.

The men said Tuesday that they planned to return to their patrols Wednesday evening.

After fleeing the platform, the attackers rode a cab to Oak and Orleans Streets, where they fled without paying their fare, according to the Chicago Tribune. Detectives are canvassing the area.

Anyone with information can call Area Central detectives at 312-747-8384.