MENA — The search for a missing Arkansas Forestry Commission pilot and his plane in Arkansas has now extended into eastern Oklahoma.

Commission spokeswoman Adriane Barnes said Sunday that the search was limited to a ground search because poor visibility prevented aircraft from taking off — but said reports that the plane may have crossed into nearby Oklahoma are being investigated.

The search for pilot Jake Harrell began Jan. 31 when he disappeared while on a flight from Oden to Wickes in search of wildfires in western Arkansas.

Winter weather conditions have hampered search efforts and Barnes says any wreckage of the aircraft may be obscured by snow and ice.

Barnes says searchers are using satellite images and information from Harrell's cellphone company in an effort to narrow the search area.