CULBERTSON, Mont. (AP) – More than 20 cars on an oil train derailed in rural northeastern Montana and at least two of them were leaking crude, authorities said. Some area homes were evacuated.

There were no immediate reports of injury or fire, but of the 21 cars that derailed only two remained upright, Roosevelt County Sheriff Jason Frederick said.

Burlington Northern Santa Fe spokesman Michael Trevino said the train was pulling 106 loaded crude oil cars when it derailed near Culbertson near the North Dakota border just after 6 p.m. MDT Thursday.

Police, fire and other emergency responders were at the site of the derailment, which forced the closure of U.S. Highway 2, the region’s main artery.

Frederick told The Associated Press that crews were not getting too close to the leaking cars until a BNSF hazardous materials team arrives from Texas.