He had already expressed a supposition: “for it to move this morning, someone possibly keyed up the train.”
An investigation is ongoing and all the possibilities are examined. “We have no indication at this point that there has been any criminal activity (…) but we are doing a thorough investigation” communicated the Chicago Transit Authority spokesman.
After the incident, the circulation on the blue line was suspended for two hours. Soon after circulation was resumed, using a single track in both directions, the trains didn't stop at the Harlem station.
