JEFFERSON COUNTY, Mo. (KSDK) - A plane crashed Monday night in Jefferson County, just south of Festus Airport.

Crystal City police say the plane went down around 9 p.m.

Capt. Ron Arnhart with the Jefferson County Sheriff's Office says they received a phone call from a woman who said her husband was flying a small plane when the plane started having problems.

PHOTOS:Small plane crashes in Jefferson County

It took officials approximately 30 minutes to locate the aircraft, which was found in the 2600 block of Plattin Road, approximately ¼ to ½ a mile from the road. Capt. Arnhart says authorities were on the phone with the pilot as they were trying to locate the crash.

Two men, identified as 65-year-old James Smith and his son, 40-year-old Christopher Smith,were on board the plane when it went down. They were pinned at one point and in pain.

James Smith's condition is said to be more serious than his son's. He was airlifted to Mercy Medical Center in St. Louis County.

Christopher Smith has been rescued from the plane, and will also be airlifted to Mercy.

Family members are at the scene of the accident.

Capt. Arnhart says after the victims receive medical attention, the scene will be secured, the FAA will be notified, and an investigation will be launched.

There's no word on what kinds of problems the plane was having before it went down.