GRANTS PASS, Ore. (AP) — The Morrow County sheriff's office says a fire that started in a northeast Oregon field west of Heppner raced quickly across as much as 20,000 acres, or some 30 square miles, before firefighters from two counties got it stopped.

Undersheriff Steven Myren says no homes or other structures were lost Wednesday although he says the fire "did get uncomfortably close to some." Some power poles and phone lines were damaged.

Myren says early estimates put the acreage burned between 15,000 and 20,000.

The fire raced nearly five miles through standing wheat and other fuels.

The cause is under investigation.