Decker, who allegedly killed his kids, has been missing for nearly three months.

LEAVENWORTH, Wash. -- After a two-day search of the area where Travis Decker allegedly murdered his three young daughters, the FBI said they will be analyzing "several items" that were recovered near the crime scene.
The FBI concluded its two-day grid search operation on Tuesday, focusing within the vicinity of Rock Island Campground in Leavenworth, Washington, where the girls bodies' were found back on June 2, W. Mike Herrington, special agent in charge of the FBI Seattle field office, said in a press release on Thursday.
The purpose of search was to "locate Travis Decker, discover signs of his whereabouts or find any other evidence of the murder of his three daughters," Herrington said.
Over 100 personnel were deployed and 1,000,000 square meters were searched, but Decker has not been located, Herrington said.
"A search of this magnitude and detail has not previously taken place in this area," Herrington said.
During the investigation, Herrington said search personnel recovered "several items that are being examined to determine if they are related to this investigation," saying that final results "will take some time."
"Finding this potential evidence emphasizes the value in having various teams search an area multiple times, especially in such challenging conditions," Herrington said.
Herrington added that officials are "committed to bringing every available FBI resource that will advance this case for as long as it takes."

During a press conference on Monday, Chelan County Sheriff Mike Morrison said officials "will not relent" and "not give up" on the search efforts, even if locating Decker takes years.