CASSELTON, N.D. — Authorities were evacuating part of a North Dakota town near the scene of a fiery oil train derailment on Monday night.

Cass County Sheriff’s Sgt. Tara Morris said as many as 300 Casselton residents might be evacuated.

Morris said there’s no immediate danger. It’s a precaution in case winds change as some derailed cars continue to burn.

No one was hurt. The cause is under investigation. Investigators couldn’t get close to the blaze and estimates of how many cars caught fire varied.

BNSF Railway Co. said it believes about 20 cars caught fire after its oil train left the tracks about 2:10 p.m. on Monday. The sheriff’s office said it thinks 10 cars were on fire.

It happened about a mile outside of Casselton, a town of 2,400 about 25 miles west of Fargo.