ULEN, Minn. (AP) — Firefighters from several departments are battling a large brush fire near Ulen in northwestern Minnesota.

Clay County Sheriff Bill Bergquist says the fire destroyed one structure Sunday, but there have been no injuries. He says one farmstead was threatened, but firefighters were able to save it, and no other structures appear to be threatened at this point.

By early Sunday evening, he said, the fire was mostly burning in some woods. He says trucks aren’t able to get in there, so firefighters are doing everything by hand or with ATVs. He says the hot weather is also making the work hard.

The sheriff says authorities heard the destroyed building was an abandoned farmstead but they couldn’t immediately confirm that.

Bergquist says the cause of the fire hasn’t been determined.