A freight train derailed in Riverside County Tuesday morning, officials said.

Six loaded "auto racks" went off the tracks in Mira Loma about 3:20 a.m., Union Pacific Railroad officials confirmed.

Aerial video showed the train cars in an upright position near Etiwanda Avenue and Van Buren Boulevard.

The 53-car train was headed to Mira Loma from Arlington, Texas, officials said.

No injuries were reported.

Additional details were not immediately available, and the cause of the derailment was under investigation.