Nearly three months since Travis Decker allegedly murdered his three daughters, officials are attempting to be "abundantly thorough" in combing through the areas near the crime scene, with the FBI closing several roads, trails and campgrounds in Leavenworth, Washington -- including the site where Decker's three children were found dead.

"We will not relent. We will not give up," Chelan County Sheriff Mike Morrison said during a press conference on Monday. "The girls would not want us to give up."

In an order posted over the weekend, the U.S. Forest Service said "all of" the Rock Island Campground, along with two other campgrounds, will be closed to "allow the FBI to conduct an ongoing investigation."

While there has not been a "break in the case," over 100 FBI personnel are on the gro

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