The FBI said Wednesday that remains discovered during last week’s grid search for fugitive father Travis Decker were reviewed and found to not be human.

Officials recovered bones during their two-day search of Washington campgrounds on Aug. 25-26 as part of the manhunt for Decker, the man accused of murdering his three young daughters. The bones were analyzed and found to not be of human origin, according to a statement Wednesday from W. Mike Herrington, special agent in charge of the FBI Seattle field office.

“During the search, personnel recovered multiple bones, including those that required additional examination to determine if they were animal or human,” Herrington said in the statement. “Central Washington University has reviewed the bones and assessed that they are not human.”

Authorities began searching for him on June 2, when he failed to return his daughters — Paityn, 9, Evelyn, 8, and Olivia, 5 — to their mother after a scheduled visitation. The children’s bodies were discovered near Rock Island Campground along Icicle Creek with bags over their heads. Autopsies confirmed they died of suffocation, and their deaths were ruled homicides.

This undated photo provided by Whitney Decker shows Paityn, Olivia and Evelyn Decker.  (Whitney Decker via AP)

The U.S. Marshals Service is offering up to $20,000 for information leading to the arrest of Decker. Authorities said he should be considered armed and dangerous. 

The Chelan County Sheriff’s Office and the Wenatchee Police Department did not immediately respond to Fox News Digital’s request for comment.