State police say an autopsy was unable to determine the cause of death for a teen who was found dead in a southern Indiana farm pond.

The body of 17-year-old Zachary Patton of Jasper was found Monday in a pond at a farm near Celestine where he was attending a party with other high school-aged students. He was last seen early Sunday morning.

Authorities searched the area about 50 miles northeast of Evansville after Patton's family reported him missing.

Indiana State Police Sgt. Jerry Goodin says foul play is not suspected in Patton's death. He says the cause of death won't be determined until toxicology tests are completed in about six weeks.