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AP law enforcement source: Fugitive ex-cop exchanges fire with S. Calif. authorities

Associated Press
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This undated photo released by the Los Angeles Police Department shows suspect Christopher Dorner, a former Los Angeles officer who killed himself on Feb. 12 after killing four people, including three police officers -- nearly 10 percent of all law enforcement officers killed by gunfire last year. (AP/Los Angeles Police Department) (The Associated Press)

LAPD spokesman Lt. Andrew Newman talks to reporters at a news conference in Los Angeles, Tuesday, Feb. 12, 2013. Police are now investigating more than 1,000 tips from the public in the search for Christopher Dorner, suspected of a deadly revenge plot against the Los Angeles Police Department. Neiman said the number of tips has grown from an initial 250 since the city offered a $1 million reward for information leading to the capture of Dorner. (AP Photo/Nick Ut) (The Associated Press)

In this Feb. 8, 2013 photo, commuters on Santa Monica Boulevard on the Westside of Los Angeles see a digital billboard displaying a large "wanted" poster for former Los Angeles police Officer Christopher Dorner. Dorner is suspected in a spree of violence as part of a vendetta against law enforcement after being fired by the department. He is also a suspect in the shooting deaths of a former LAPD captain's daughter and her fiance, and two other shootings that left an officer dead and two others wounded. Dorner's alleged killing spree hasn't just terrorized a large section of the country _ it has captured people's imagination and attention. (AP Photo/Reed Saxon) (The Associated Press)

A law enforcement official says a person believed to be the fugitive ex-Los Angeles cop sought in three killings has exchanged gunfire with authorities in the San Bernardino Mountains.

The officer requested anonymity because the officer was not authorized to speak publicly about the ongoing investigation.

The officer tells The Associated Press it's believed Christopher Dorner committed a residential burglary of a cabin and had a couple tied up in the cabin. One was able to get away and make a call.

Authorities responded to the location and gave chase Tuesday when Dorner fled in a stolen car. Gunfire was exchanged.