Trooper Angela Bieber at the state police barracks in Montoursville said Sunday morning that Lycoming County Coroner Charles Keissling is expected to confirm the cause of their deaths later in the day.
Authorities have said the two adults and three children had toxic levels of carbon monoxide in their blood when they were found Saturday. Bieber says there's no indication they tried to escape and all five apparently died in their sleep.
Bieber says a relative of the cabin's owner hosted a get-together Friday night and slept in his truck outside the cabin. He discovered the bodies Saturday.