KEMPTON (AP) — A coroner says more testing is needed to determine what caused the deaths of an 8-year-old boy and his 4-year-old sister.

Conner Snyder and his sister, Brinley Snyder, both died at a hospital Thursday, three days after they were found unconscious in their home in Albany Township, Berks County.

An autopsy performed Monday was inconclusive. The coroner says forensic testing is needed before he can rule on the cause and manner of death.

Pennsylvania State Police and the district attorney’s office are also investigating. Authorities have said only that the siblings suffered some sort of injury.