CHICAGO -- At least 33 people were injured near Chicago after two trains crashed Monday morning, according to CBS.
Initially, police told CBS Chicago the accident was being investigated with the possibility that somebody hijacked a CTA train. However, both CTA and federal officials now say the crash was likely an accident.
According to the CTA, a westbound train was stopped when another train - traveling east on the same track - smashed into it.
Forest Park Mayor Anthony Calderone said the injuries were mostly minor. The report from CBS says none of the injuries appear to be life threatening. The number of passengers on the trains is unclear at this time.
The CTA said there is no indication of criminal activity. They are investigating the accident with local law enforcement, and they believe there was a mechanical malfunction.
A CTA spokesman told CBS Chicago the stationary train was marked "out of service" and the collision happened at a "pretty slow speed."
According to early reports from CBS Chicago, police thought the train may have been hijacked because the train causing the crash only had four cars - rush hour trains typically have more cars. Robert Kelly, of Amalgamated Transit Union 308, said somebody would need a key to drive the train from the Forest Park yard.