Authorities are trying to determine the cause of a freight train derailment in northern Arizona that heavily damaged 23 cars and a load of new vehicles.

Coconino County Emergency Management officials said the derailment occurred around 11:20 p.m. Wednesday east of Williams, which is 33 miles west of Flagstaff.

They said the BNSF train cars were carrying a variety of new cars, vans and truck.

Photos from the derailment scene showed heavy damage to many vehicles and freight cars, white vans poking out of other damaged rail cars and an upside-down vehicle crushed under another freight car.

PHOENIX DOUBLE MURDERER SENTENCED TO DEATH FOR BRUTAL CRIMES COMMITTED IN 1990

County Emergency Management officials said cleanup was already underway Thursday morning.

There was no immediate word from Texas-based BNSF Railway about the derailment.

There have been a rash of train derailments across the country in recent months, deepening concerns about rail safety in the U.S.