BELMONT COUNTY, Ohio (WTRF) — An Amish man and his 10-year-old son died of drowning Saturday, according to Belmont County Sheriff’s Department Chief Investigator Ryan Allar.

Allar said it happened at a pond on gas and oil property that was fenced off and marked with signs warning no trespassing or swimming was allowed.

Allar said they believe the 10-year-old slid into the water and the father went in after him.

Allar said the pond has a plastic liner like a swimming pool, and they were not able to get out because it was slippery.

He said a younger son with them, age 8, went for help, walking at least half a mile to try to alert someone.

Allar said the call came in at 6:30 p.m. Saturday on Rock River Road in Belmont County, near the small community of Boston.

“This is a horrible tragedy, and our hearts go out to the family,” said Allar. “But hopefully this alerts others to the dangers of swimming where it is not allowed.”