NEARALEDO -- A UnionPacific train derailed early Thursday morning east of Aledo, authorities confirmed.

A locomotive and four cars went off the tracks as the train traveled into Tarrant County on its way from Tucson, Ariz. to Dallas, according to a UnionPacific representative.

One train crew member suffered injuries and was taken to an area hospital. His condition wasn't known.

Firefighters are checking each of the train cars to see if any hazardous materials were on board.

The cause of the train derailment is under investigation.

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