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Photo: The Canadian Press. All rights reserved.

Los Angeles police Lt. Andrew Neiman, left, takes questions from the media at news conference about conviction of former police officer Christopher Jordan Dorner, outside the LAPD headquarters downtown Los Angeles Monday, Feb 11 County. (AP Photo/Nick Ut)

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 policeman in Riverside.

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 Los Angeles Police Department 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 (130 kilometres) east of Los Angeles after his burned-out truck was found there last Thursday. That effort was scaled back over the weekend, when authorities announced the reward.