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Christopher Dorner may have tried to cross the Mexican border, court documents show

The San Ysidro border crossing, in a 2008 file photo taken in Tijuana, Mexico.
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TORRANCE, Calif. Federal court records filed Monday indicate that the former LAPD police officer accused of killing three people may have tried to flee to Mexico with the help of a friend.

The documents, which include an arrest affidavit, were filed with the U.S. District Court on Monday, reports CBS station KCBS in Los Angeles.

"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," an investigator with the U.S. Marshals said in the documents.

The records detail the 33-year-old's alleged movements following the murders of Monica Quan and her fiance, Keith Lawrence on Feb. 3 and Riverside Police Officer Michael Crain on Feb. 7.

Dorner is wanted as a suspect in all three crimes.

Officials say Dorner may have tried to flee to Mexico with the help of an unidentified associate who lives in the Big Bear area.

Last week, authorities tracked the associate's movements and surveyed his property, during which, they discovered Dorner's burned out truck nearby.

New surveillance video obtained by entertainment website TMZ.com Monday reportedly depicts Dorner at a South Bay store just days before the murders.

The security footage reportedly shows Dorner purchasing scuba equipment at the Torrance Sports Chalet just two days before the Irvine murders.

The Los Angeles Police Department is not confirming that the man in the video is Dorner.

Police think that equipment was possibly purchased to help in his flight to Mexico.

On Feb. 6, Dorner reportedly tried to steal a boat in the Port of San Diego, but was unsuccessful.

The federal documents also state that on the same day "an agent found Dorner's personal belongings, including his wallet and identification cards, near the US/Mexico border at the San Ysidro point of entry."

U.S. Marshals say there is no further evidence indicating that Dorner is in Mexico.