FREDERICKSBURG, Texas (AP) Two Kerrville men died Monday after their ultralight plane crashed in the Texas Hill Country.

Gillespie County authorities say the two-seat lightweight aircraft crashed on a ranch near Fredericksburg, and it wasn't immediately clear what caused the plane to go down. Witnesses reported hearing the engine sputtering and a flapping sound and the aircraft began to spin prior to impact, Texas Department of Public Safety said in a recorded message Monday.

The crash site was about 10 miles south of Fredericksburg, off of State Highway 16.

The DPS identified the victims as 48-year-old Roger Nathanson, and 62-year-old James Stokes, both of Kerrville.

The bodies of the two men were taken to a Fredericksburg funeral home, San Antonio television station KABB reported.

Gillespie County Chief Deputy Mel Gideon says he suspects the plane took off from private property since the local airport had no record of the flight.

The crash was first reported by San Antonio television station KENS.

Fredericksburg is about 80 miles west of Austin.

Copyright 2009 The Associated Press.