SHAWNEE, Okla. (AP) — Dry conditions plus blown-down trees from a tornado several years ago in central Oklahoma are fueling a wildfire that continued to burn Wednesday. No structures have been lost and no one has been hurt.

Oklahoma Forestry Services spokeswoman Michelle Finch-Walker says the fire burning near Shawnee was about 60 percent contained as of Wednesday morning.

So far, the fire has burned about 140 acres in the area. Finch-Walker says officials are still investigating what sparked the blaze, but it appears to be "human-caused" because there were no signs of natural causes, such as a lightning strike.

Finch-Walker says the fire is expected to keep burning within the perimeter created by firefighters for several days, until the next rains occur.