WALTERBORO, S.C. (AP) — A 13-year-old boy and his parents were shot to death at their home in rural South Carolina and deputies were investigating whether drugs played a role in the killings, authorities said.

Investigators have not determined a motive for the triple homicide Tuesday afternoon or any suspects, but are following several leads, Colleton County Sheriff's Lt. Tyger Benton said. Authorities found marijuana at the home but wouldn't say exactly how much, only that it was more than what's considered for personal use.

Deputies rushed to the home after a 911 caller reported a shooting in Ruffin at a home on U.S. Highway 21, Benton said.

The parents were found dead inside the home, and the teen's body was outside in a small area between the sidewalk and the highway. The 9-year-old granddaughter of the adults was shot in the leg and survived.

"She was in surgery. She's doing fine," Benton said.

A small child was also found unharmed in the home.

Investigators identified the slain as Phillip Miller, 46; his wife, Lori Miller, 52; and their son Vincent Miller, 13, according to the Colleton County Coroner's Office.

Ruffin is an unincorporated town about 50 miles northwest of Charleston.

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This story corrects that the 13-year-old boy was the son of the adult victims, not the grandson.