Two trains collided this morning in suburban Chicago leaving dozens injured and local police considering the possibility of foul play. Injury estimates range from 33 (via the Chicago Transit Authority) to 48 (via the mayor of Forest Park, where the crash happened), although fortunately, according to the Chicago Tribune, none of are considered to be serious.
According to authorities, a train carrying passengers that was stopped at the station was struck by an unmanned train headed the opposite direction on the same track. How the unmanned train started down the track is still unclear. Here's CBS Chicago with the details:
Police were investigating the possibility that somebody deliberately caused the accident. However, CTA and federal officials believe the crash was likely an accident. Suspicion that the train was stolen or hijacked was raised because the train that caused the crash only had four cars. Rush hour trains typically have many more cars and would not have left the train yard with so few cars.
Robert Kelly of the local transit workers union says the crash was more than likely caused by a mechanical failure, but the investigation is ongoing.