NAVASOTA, Texas (AP) — Eight Union Pacific cars have overturned in Central Texas and at least one tanker leaked a hazardous chemical used in natural gas processing.

The Grimes County Sheriff’s Office says nobody was hurt in Monday’s derailment near Navasota (nah-vuh-SOH’-tuh). Authorities are trying to determine what caused the derailment in an area about 65 miles northwest of Houston.