A criminal mischief incident is being investigated by state police at Frackville occurring in Schuylkill County.

Troopers said unknown criminals threw a rock through the rear window of the 2003 Dodge Dakota pickup truck of Thomas Shawn Schreppel, 26, of Zion Grove, while it was parked at 145 Quality Hill Road, in Gilberton. The incident occurred sometime between 3:30 p.m. on Tuesday, March 26, and noon on Wednesday.