US hunt intensifies for fugitive ex-cop
Representatives of the Marshals Service could not immediately be reached for comment.
The affidavit, filed as part of a criminal complaint charging Dorner with unlawful flight to avoid prosecution, said US marshals had "probable cause" to believe he had gone to Mexico.
That conclusion it said, was based in part on "recent observations of a suspect matching Dorner's description attempting to flee to Mexico" and an alleged statement by Dorner himself during a failed attempt to steal a boat in San Diego last Thursday.
US marshals asked police in the Mexican border town Tijuana on Thursday to be on the lookout for Dorner, and Tijuana authorities distributed flyers with information about him to their patrol units that day, according to Francisco Javier Viruete Munguia, director-general of police and transit there. But he said the effort had so far failed to produce any leads.
US Customs and Border Protection agents joined the manhunt over the weekend by conducting special vehicle screenings of Mexican-bound vehicles at the California border.
Los Angeles Police Chief Charlie Beck has said that the $1 million reward, raised from private donations, police unions, businesses and local governments, was the largest sum ever offered in Southern California in a criminal investigation.
Mr Beck described the manhunt for Dorner as the most extensive ever mounted in the Los Angeles area.
A manifesto posted on Dorner's Facebook page last week claimed he was wrongly terminated from the Los Angeles Police Department in 2008 and vowed to seek revenge by unleashing "unconventional and asymmetrical warfare" on police officers and their families.
Last Wednesday he was named as a suspect in the slayings of a campus security officer and his fiancee, the daughter of a retired Los Angeles police captain who Dorner blamed in his manifesto for his dismissal.
The couple, Keith Lawrence (27), and Monica Quan (28), were found shot dead three days earlier, on February 3rd, in their car on the top level of a parking structure in the city of Irvine, south of Los Angeles.
Dorner had ended his military service two days earlier, and the Navy has not disclosed the circumstances of his discharge.
Mr Beck announced on Saturday a reopening of the inquiry into Dorner's firing to "reassure the public that their police department is transparent and fair".
The Los Angeles Police Department also has opened an investigation into an incident in which two women were wounded when apparently skittish officers opened fire on a pick-up truck resembling Dorner's. The two women were delivering newspapers when they were shot.