This image provided by the Burbank Police Department shows an undated photo of FBI agent Stephen Ivens. (AP Photo/Burbank Police Department)
(CBS/AP) BURBANK, Calif. - Law enforcement officers in Southern California searched in rugged mountain terrain for a second day on Sunday for a missing FBI agent who was said to be despondent and possibly suicidal.
About 100 FBI agents, 40 sheriff's department rescuers and a dozen local police officers participated in the search for Los Angeles-based Special Agent Stephen Ivens. He was described as an avid hiker and runner.
FBI Special Agent Steve Gomez said dogs had tracked Ivens' scent toward the Verdugo Mountains, east of Burbank, but searchers have fanned out throughout Los Angeles County.
According to CBS station KCBS in Los Angeles, police will be focusing their search in the area directly surrounding the Ivens' home. Federal investigators will take over the more involved search in the Burbank and Glendale hills.
Ivens, 35, was last seen by family members Thursday evening, authorities said. He left his Burbank home the next morning on foot and had not been seen since, FBI officials said at a news conference. His wife reported him missing Friday at 7:30 a.m.
Ivens was distraught, according to KCBS. Officials did not say why Ivens was emotionally disturbed, but the FBI is working to find out if Ivens' work had anything to do with his disappearance.
A search of his home did not turn up his handgun and police believe he may have taken it with him.
Ivens was described by FBI colleagues as well liked. He is a devoted agent with no history of disciplinary action on the job, according to FBI spokeswoman Laura Eimiller.
Married with a one-year-old child, he has been working for the FBI for the past three years in the national security area. Prior to that, he worked as a Los Angeles police officer for eight years.
Gomez told reporters that foul play was not suspected and Ivens was not believed to pose a threat to others.
© 2012 CBS Interactive Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.
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