HOOKSTOWN — A coroner says a 4-year-old boy found dead in a Western Pennsylvania septic tank had drowned, but she says his manner of death couldn't be determined.

Wyatt Smitsky's body was found Sept. 5 after searchers drained a septic tank on property near his home in Greene Township, about 25 miles northwest of Pittsburgh.

Beaver County Coroner Teri Tatalovich-Rossi said today the manner of death could change with more information.

Investigators have been trying to determine whether his death was a homicide, the result of negligence or an accident. The boy was playing with two young sisters when he went missing, prompting an 18-hour search.