A Santa Fe freight train derailed Friday in a remote region in north-central Texas and two police officers were overcome with fumes from spilled chemicals.

None of three people aboard the train, heading from Louisiana to Fort Hood in Killeen, was injured when 13 cars derailed near Alvarado.Two Alvarado officers were treated at a hospital as a precautionary measure after breathing chemical fumes and were later released, said police Sgt. Gerald Tucker.

A state Department of Public Safety dispatcher said two chemicals spilled from the derailed cars. The amount and types of chemicals spilled was not immediately known.

"There is hazardous material involved in the cars that are derailed," said Ken Jure, an assistant superintendent for Santa Fe railroad.

A portion of the train in front of the derailment was carrying military equipment, including tanks and other equipment, to Fort Hood, officials said.