PORTLAND, Ore. (AP) The U.S. Forest Service says a forest fire south of Sisters two months ago was probably caused by lightning.

The Pole Creek fire eventually burned on more than 26,000 acres and gave residents of Sisters a couple of weeks of difficult mornings as temperature inversions trapped the smoke.

The Forest Service said Tuesday that investigators had trouble determining a cause because the fire was intense, burning evidence.

But investigators said they determined there was an isolated thunderstorm in the area on Sept. 8 and witnesses reported lightning strikes. A large fir tree was burned, hollowed out, and broken at the base.

The investigators said the fire started in a remote area, reducing the possibility it was set.

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