Update 12:18 p.m.

At least 33 people were taken to local hospitals Monday when an out-of-service Chicago Transit Authority train crashed head-on with another train stopped at a Forest Park, Ill., suburban station west of Chicago, local media report.

The Chicago Tribune quotes the CTA as saying 33 people were taken to nine hospitals, but that there were no serious injuries.

CBS 2 reports that police are investigating the possibility that somebody hijacked an out-of-service CTA train and sent it crashing into the second train.

Suspicion of foul play was raised because the out-of-service train had far fewer cars than a normal rush-hour train, was on the wrong tracks and had nobody at the controls when the crash occurred.

Although police are treating the accident as a crime scene, a CTA official tells CBS that there is no indication of criminal activity and that the CTA is working under the theory that the accident is due to a mechanical malfunction.

The collision occurred at the Harlem station on the Blue Line in the town located about 7 miles west of Chicago.

The Tribune reports that the crash occurred around 8 a.m. CT.

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At least 48 people have been taken to hospitals Monday in Forest Park, Ill., following a head-on collision involving two Chicago Transport Authority trains, according to the Forest Park Mayor Anthony Calderone, local media report.

The suburb of Forest Park is located about 7 miles west of Chicago.

WGN-TV reports that 11 people were injured in the incident.

The Chicago Tribune reports that one out-of-service CTA train ran head-on into another that was stopped at a Blue Line station in Forest Park around 8 a.m. CDT.

The newspaper quotes CTA spokeswoman Lambrini Lukidis as saying the crash occurred at the Harlem station. She said there were no passengers on the out-of-service train.

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