Homes were evacuated in Pennsylvania Monday morning after a train carrying hazardous materials derailed.

A 40-car CSX freight train derailed in Montgomery County just before 5 a.m. causing emergency crews to respond to Whitemarsh Township, according to CBS News. CSX said at least 16 cars went off the tracks but officials alter confirmed 15 cars derailed.

Precautionary evacuations have occurred at the residents and businesses closest to the scene. It is not believed that further evacuations will be needed, but we will evaluate as we know more,” the Whitemarsh Township Police Department said.

Police added silicon pellets were leaking from at least one train car but that they posed no risk to the public.

During a news conference, officials said among the other drailed cars, five contained urea which is a liquid fertilizer and another had tetrachloroethylene, which is used as a dry cleaning agent and metal degreasing solvent.

No injuries have been reported.

The cause of the derailment is under investigation but a CSX spokesperson said it was possibly weather-related.

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