LOS ANGELES (AP) — A man fatally shot his father, brother and two other people Thursday during a 12-hour rampage across Los Angeles' sprawling San Fernando Valley, eluding a manhunt until he was arrested after gunning down a bus passenger, authorities said.

Police said they did not know what motivated Gerry Dean Zaragoza to launch the attacks in neighborhoods dotting the vast, largely suburban valley that is home to nearly 2 million Los Angeles residents.

"It is obviously an individual that went on a violent spree," police Capt. William Hayes said. "We knew he was a danger to the community."

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