Investigators are attempting to determine what caused a freight train to derail in Philadelphia's Tioga-Nicetown section Friday morning.
No one was injured in the derailment, which happened about 3:30 a.m. on CSX tracks near 22nd Street and Hunting Park Avenue, CBS Philly reports.
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The four freight train cars that ended up on their sides did not contain any hazardous materials, according to the report.