RIVERSIDE, Calif. — Hundreds of tips prompted by a $1 million reward poured in to authorities seeking help finding the most wanted man in America, an ex-Los Angeles police officer who was charged Monday with murdering a Riverside policeman.

With thousands of officers around Southern California searching for Christopher Dorner, prosecutors in Riverside announced charges for last week's killing. Dorner also was charged with attempted murder for wounding another officer and firing at two others, Riverside County District Attorney Paul Zellerbach said.

Authorities obtained a no-bail arrest warrant, which allows Dorner to be apprehended anywhere, Zellerbach said.

The manhunt for Dorner, 33, 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.

"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 that was guarded by four officers armed with rifles.

Police say Dorner wrote a lengthy manifesto that was posted to Facebook after the double murder. He vowed deadly revenge on those in the LAPD responsible for his firing years earlier, and their families. Police now are providing protection for some 50 families thought to be targets.

The search for Dorner was focused in the mountains near Big Bear Lake about 80 miles east of Los Angeles after his burned-out truck was found there last Thursday. Authorities are searching more than 30 square miles day and night in the ski resort area and checking on roughly 600 cabins.

Police and city officials believe the reward, raised from public and private sources, will encourage citizens to stay vigilant. More than 700 tips had come in since the reward was announced.

"Now it's like the game show `Who Wants to be a Millionaire,'" said Anthony Burke, supervisory inspector for the U.S. Marshals regional fugitive taskforce. "Instead of one contestant, we've got 100,000, and there's only one question you have to answer. All they have to answer is where he's at, and we can take it from there."

The wide-ranging search has created unusually heavy traffic backups at California border crossings into Mexico, as agents are more closely inspecting each car. State police in Mexico's Baja California were given photographs of Dorner and warned to consider him armed and extremely dangerous.

Zellerbach said authorities believe Dorner will emerge at some point and try to continue carrying out his vendetta.

"I don't think he's done," Zellerbach said. "Just read his manifesto and look at his actions. He's trying to send a message, and it would be my belief that his message is not completed yet."

Dorner was fired from the LAPD five years ago, when a department board determined that he falsely claimed another officer had kicked a suspect. Randal Quan represented him during the proceeding.

Quan's daughter, Monica, and her fiance, Keith Lawrence, were found shot dead Feb. 3 in a car in the parking structure of their Irvine condominium. Last Wednesday, after discovery of the manifesto, Irvine police announced they were searching for Dorner.

Early Thursday in the Riverside County city of Corona, police say Dorner shot at two LAPD officers who had been dispatched to protect a possible target of Dorner's. One officer's head was grazed by a bullet; the other was unharmed.

Minutes later, authorities said Dorner used a rifle to ambush two Riverside officers, killing one and seriously wounding another. The slain officer was identified as Michael Crain, 34. The other officer's identity was not released to protect his family.

___

Abdollah reported from Los Angeles. AP writer Elliot Spagat contributed to this report from San Diego. Abdollah can be reached at . http://www.twitter.com/LATams

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  • In this image taken from video provided by KABC-TV, the cabin in Big Bear, Calif. where ex-Los Angeles police officer Christopher Dorner is believed to be barricaded inside is in flames Tuesday, Feb. 12, 2013. (AP Photo/KABC-TV) MANDATORY CREDIT: KABC-TV

  • In this image taken from video provided by KABC-TV, the cabin in Big Bear, Calif. where ex-Los Angeles police officer Christopher Dorner is believed to be barricaded inside is in flames Tuesday, Feb. 12, 2013. (AP Photo/KABC-TV) MANDATORY CREDIT: KABC-TV

  • Bill Whalen, Andrew Smith, Norma Eisenman

    Los Angeles Police Commander Andrew Smith, second from left, expresses condolences for the death of a San Bernardino County deputy, as he briefs the media about the shootout scene in Big Bear that allegedly involves triple-murder suspect Christopher Jordan Dorner, during a late news conference in front of the Police Administration Building in Los Angeles, Tuesday, Feb. 12, 2013. Lt. Bill Whalen, of the Irvine Police Department, far left, and LAPD Officer Norma Eisenman, right, stand with Smith. (AP Photo/Damian Dovarganes)

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  • Cindy Bachman, public information officer for the San Bernardino County Sheriff's Department, talks about the hunt for accused killer and fired Los Angeles police Officer Christopher Dorner in Angelus Oaks, Caif., Tuesday, Feb. 12, 2013. (AP Photo/Chris Carlson)

  • A Redlands Police officer walks near a road blockade near the entrance to the San Bernardino National Forest in southern California after Christopher Dorner, a fugitive ex-Los Angeles cop sought in three killings, engaged in a shootout with authorities that wounded two officers in the San Bernardino Mountains near Big Bear Lake, Tuesday, Feb. 12, 2013. (AP Photo/The Sun, Gabriel Luis Acosta) VENTURA COUNTY STAR OUT; RIVERSIDE PRESS-ENTERPRISE OUT; THE VICTOR VALLEY DAILY PRESS OUT

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    YUCAIPA, CA - FEBRUARY 12: Redlands police officers secure at a blockade during a manhunt for the former Los Angeles Police Department officer Christopher Dorner who is suspected of triple murder on February 12, 2013 in Yucaipa, California. Dorner barricaded himself in a cabin near Big Bear, California and is in a standoff with authorities after shooting two police officers, killing one and wounding the other. Dorner, a former Los Angeles Police Department officer and Navy Reserve veteran, is wanted in connection with the deaths of an Irvine couple and a Riverside police officer. (Photo by Kevork Djansezian/Getty Images)

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    Shantel Cardiel (L) and Frank Cardiel hold up signs in support of fugitive triple murder suspect Christopher Dorner along the road in San Bernardino, California n February 12, 2013. Fugitive former US cop Christopher Dorner exchanged gunfire with police near a Californian ski resort where his burnt-out truck was found, reports said. The 33-year-old was involved in the shooting after he tried to burglarize a home near Big Bear, two hours east of Los Angeles, the Los Angeles Times reported, citing a law enforcement source.   AFP PHOTO / David McNew (Photo credit should read DAVID MCNEW/AFP/Getty Images)

  • US-CRIME-POLICE-INCIDENT

    Shantel Cardiel holds up a sign in support of fugitive triple murder suspect Christopher Dorner along the road in San Bernardino, California n February 12, 2013. Fugitive former US cop Christopher Dorner exchanged gunfire with police near a Californian ski resort where his burnt-out truck was found, reports said. The 33-year-old was involved in the shooting after he tried to burglarize a home near Big Bear, two hours east of Los Angeles, the Los Angeles Times reported, citing a law enforcement source.   AFP PHOTO / David McNew (Photo credit should read DAVID MCNEW/AFP/Getty Images)

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    ANGELUS OAKS, CA - FEBRUARY 12: A San Bernardino Sheriff's Department deputy watches as a car is towed away after a standoff and a shootout with former Los Angeles Police Department officer Christopher Dorner who is suspected of triple murder on February 12, 2013 in Angelus Oaks, California. Dorner barricaded himself in a cabin near Big Bear, California which later caught fire. According to the LAPD the cabin remains too hot to enter and a body has not been located. (Photo by Kevork Djansezian/Getty Images)

  • Law Enforcement personnel gear up along Hwy 38 during the hunt for accused killer and fired Los Angeles police officer, Christopher Dorner in Yacaipa, Caif.,Tuesday, Feb. 12, 2013. Dorner, a man police believe to be the fugitive ex-Los Angeles officer wanted in three killings, was barricaded inside a burning cabin Tuesday after a shootout in a California mountain town that left one deputy dead and another wounded. (AP Photo/Chris Carlson)

  • Andrew Smith

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  • Law Enforcement personnel block Hwy 38 during the hunt for accused killer and ex-Los Angeles police officer Christopher Dorner in Yacaipa, Caif., Tuesday, Feb. 12, 2013. Dorner is believed to be barricaded in a cabin Tuesday after a furious gunbattle with police in the snow-covered mountains of Southern California, authorities said, the culmination of an intensive manhunt that left a region an edge for nearly a week. (AP Photo/Chris Carlson)

  • Law Enforcement personnel search a vehicle along Hwy 38 during the hunt for accused killer and ex-Los Angeles police officer Christopher Dorner in Yacaipa, Caif., Tuesday, Feb. 12, 2013. Dorner is believed to be barricaded in a cabin Tuesday after a furious gunbattle with police in the snow-covered mountains of Southern California, authorities said, the culmination of an intensive manhunt that left a region an edge for nearly a week. (AP Photo/Chris Carlson)

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  • A Redlands Police officer walks near a road blockade near the entrance to the San Bernardino National Forest in southern California near Big Bear Lake, Tuesday, Feb. 12, 2013.

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  • A San Bernardino County Sheriff SWAT team returns to the command post at Bear Mountain near Big Bear Lake, Calif.

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  • San Bernardino County Sheriff's deputies gather at the command post in Big Bear Lake, Calif, Saturday, Feb. 9, 2013. Clear skies allowed aircraft with heat-sensing technology to aid scores of officers searching in the snow-covered San Bernardino Mountains for Christopher Dorner, the former Los Angeles police officer suspected of killing three people in a vengeance-fueled rampage aimed at those he blames for ending his career. (AP Photo/Jae C. Hong)

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  • Christopher Dorner

    This undated photo shows suspect Christopher Dorner. (AP Photo/Los Angeles Police Department)

  • Christopher Dorner

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