SAN DIEGO (CBS 8/AP) - According to an affidavit filed by the U.S. Marshals Service, investigators believe fugitive ex-LAPD officer and triple murder suspect Christopher Dorner probably escaped into Mexico.
The manhunt for Dorner has stretched across Southern California, briefly focusing on the mountain town of Big Bear, his mother's home in La Palma, and various locations in San Diego.
In the affidavit obtained by News 8, U.S. Marshals Inspector Craig McClusky wrote "there is probable cause to believe that Dorner has moved and traveled in interstate and foreign commerce from California to Mexico with the intent to avoid prosecution."
Customs and Border Protection said Monday that it has joined efforts to find the 33-year-old suspect. Heightened vehicle inspections were producing delays at the San Ysidro border crossing into Tijuana.
Baja California state police agents assigned to search for American fugitives were given photographs of Dorner. International liaison Alfredo Arenas says the Mexican agents have been warned to consider the suspect armed and extremely dangerous.
The manhunt for Dorner began last Wednesday when he was named the suspect in the Orange County murders of a former Los Angeles police captain's daughter and her fiance the previous weekend. Hours after police announced they were looking for him, Dorner first fired at two LAPD officers, then ambushed the Riverside officers.
Newly released surveillance video is helping investigators piece together Dorner's movements before the first murders.
TMZ posted video apparently showing Dorner purchasing scuba gear at a Sports Chalet in Torrance just two days before the killing began.
Dorner was a member of the Naval Undersea Warfare Unit, and is accused of trying to steal a boat from the Southwest Yacht Club near Shelter Island.
Authorities announced Sunday that they are offering a one-million dollar reward to the public for information leading to Dorner's arrest and conviction.
Hundreds of tips poured in to authorities seeking help finding the most wanted man in America.
The Riverside County District Attorney's office charged Dorner Monday with murdering a Riverside officer in a potential death penalty case.
Dorner was also charged with the attempted murder of another Riverside officer and two Los Angeles Police Department officers, Riverside County District Attorney Paul Zellerbach said.
The LAPD officers and the Riverside officers were fired on in two separate shootings early Thursday after Dorner, became the target of a manhunt following the killing in Irvine of a former LAPD captain's daughter and her fiance the previous weekend.
"By both his words and conduct, he has made very clear to us that every law enforcement officer in Southern California is in danger of being shot and killed," Zellerbach said at a news conference guarded by four officers armed with rifles.
Authorities obtained a no-bail arrest warrant, which allows Dorner to be apprehended anywhere, Zellerbach said.
Anyone with a tip on Dorner's whereabouts should call (213) 486-6860 or (800) 222-8477.