Nearly three months into the investigation of the murders of three young girls in Washington state, the FBI is leading a new search for clues in hopes of finding the girls' father and suspect in their killings, Travis Decker , the local sheriff said Monday.

The search is taking place near Rock Island Campground outside of Leavenworth, Washington, where the bodies of the girls and Decker's truck were found on June 2. Chelan County Sheriff Michael Morrison described the search area as "rugged and heavily forested terrain."

"The areas being searched are extremely challenging with steep hillsides, dense brush, minimal cell service, and unpredictable conditions," he said in a statement .

The search for Decker so far has not produced conclusive evidence to indicate if he is alive or

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