Two trains collided head-on on a stretch of track south of Philadelphia around 8:25 a.m. Friday, leaving four people injured, according to officials.

Two people were taken to Crozer Chester Hospital after the crash on a track interlocking Kerlin Street and Concord Road in Chester, Pennsylvania. Conditions of the victims are not yet available, but emergency responders described their injuries as minor.

Two freight trains owned by CSX Transportation were involved in the crash, according to Rob Doolittle, the transportation company's director of communications and media relations.

Both trains were moving at the time of the accident. One was traveling from Richmond, Virginia to Pavonia, New Jersey with three locomotives and 64 empty freight cars and the other was traveling from Quebec, Canada to Atlanta Georgia with one locomotive and eight intermodal cars carrying consumer goods and food products, Doolittle said.

CSX is cooperating with law enforcement to investigate the crash and understand the circumstances that caused it.

It was not immediately clear what caused the trains to be on the same track.