Officials say the bones will be analyzed to determine whether they are animal or human.

LEAVENWORTH, Wash. — The Federal Bureau of Investigation (FBI) confirmed Friday that it recovered bones during a two-day search at the campground where Travis Decker is believed to have killed and left his three young daughters in May.

On Thursday, the FBI announced that it had uncovered “several items” that were considered “potential evidence” during the search at Rock Island Campground. Decker’s three daughters, Paityn, Evelyn and Olivia, were found there on June 2 and Decker has not been seen since he is believed to have kidnapped the girls on May 30.

The FBI says the bones will be analyzed to determine whether they are animal human. No further information about the bones was released.

In total, the search involved over 100 personnel who spent the two-day search documenting about 247 acres. The FBI worked with both the Chelan and Spokane County sheriff’s offices, the U.S. Marshals Service, Port of Seattle Police Department, Yakima Police Department and other federal and state officials.

Police found Decker’s truck at the campground on June 2, and the girls were found dead nearby. The discovery prompted a manhunt for Decker throughout the Cascades; however, he has evaded authorities for nearly three months. 

Search efforts have slowed in recent weeks. Earlier this month, the King County Sheriff’s Office sent patrols to Snoqualmie Pass after a reported sighting of Decker but called off the search after several hours.

The U.S. Marshals Service has worked with Chelan County to search tens of thousands of acres near Blewett Pass and the Enchantments.

Anyone who sees Decker is urged to call 911 immediately and not to try contacting or approaching him. The U.S. Marshals Service is still offering a reward of up to $20,000 for information leading directly to his arrest.