BURBANK (CBS) — Federal investigators were assisting police on Monday in the search for a missing FBI agent from Burbank.

KNX 1070′s Pete Demetriou reports police have indicated they will now concentrate their efforts on the area directly surrounding the home of Stephen Ivens.

Ivens, 35, was first reported missing on Friday when he was last spotted by relatives at his home in the 1700 block of Scott Road.

Officials on Saturday described Ivens as distraught and possibly suicidal after his service weapon was found missing from his apartment.

Over 150 personnel from the FBI, Los Angeles County Sheriff’s Department, and police units initially centered their investigation on the Verdugo foothills after bloodhounds tracked Ivens’ scent in the surrounding area.

Burbank Police Capt. Dennis Cremins said investigators still are unsure of Iven’s whereabouts.

“There’s no evidence of foul play right now, but that’s why we still have a robust effort to locate him,” said Cremins.

Police will now shift their focus to a traditional missing persons investigation while federal investigators take over the more extensive search in the hills above Burbank and Glendale.

The FBI is working to determine whether Ivens’ work in the national security section of the Bureau’s Los Angeles office played any role in his disappearance.