Authorities say blood discovered at a campsite where three young Washington state sisters were found dead last week belonged to a male.

Paityn Decker, 9; Evelyn Decker, 8; and Olivia Decker, 5, were located on June 2 near the Rock Island Campground in Chelan County, Washington, police said.

The sheriff's office leading the search, which has covered hundreds of square miles, said it has reached the point “where we need to rest our local resources.”