Burlington Northern Santa Fe Railroad is trying to determine what caused six train cars to derail early this morning on a side track in eastern Lawrence.

The cars, which were carrying wheat, did not overturn, BNSF spokesman Steve Forsberg said. The derailment occurred at 12:30 a.m. east of 11th Street and Haskell Avenue. There were no injuries or collisions.

Work crews have been on the scene for several hours making repairs but Forsberg didn’t know when those repairs would be finished.

The city of Lawrence closed 11th Street east of Haskell and Douglas County closed County Road 1550 on the east side of the derailment. They will remain closed until track repairs are completed. Motorists should be alert for large trucks moving in and out of the area.