Search for fugitive ex-LA cop slows border traffic

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San Bernardino County Sheriff's officer Ken Owens searches a home for the former Los Angeles police officer Christopher Dorner in Big Bear Lake, Calif, Sunday, Feb. 10, 2013. The hunt for the former Los Angeles police officer suspected in three killings entered its fourth day in the snow-covered mountains on Sunday, a day after the police chief ordered a review of the disciplinary case that led to the fugitive's firing and new details emerged of the evidence he left behind. (AP Photo/Jae C. Hong)

SAN DIEGO (AP) — U.S. border inspectors are warning of unusually heavy traffic at California border crossings into Mexico amid the search for a fugitive ex-police officer wanted in the slayings of three people.

Customs and Border Protection said Monday that it has joined efforts to find 33-year-old Christopher Dorner in Southern California. Heightened vehicle inspections are producing delays at San Diego's San Ysidro (ee-SEE'-droh) border crossing into Tijuana.

Baja California state police agents assigned to search for American fugitives have been given photographs of Dorner. International liaison Alfredo Arenas says the Mexican agents have been warned to consider the suspect armed and extremely dangerous.

Dorner was charged Monday with murdering a police officer and attempting to murder three others in Riverside County.