Shooting Rampage in California: Inside the Moment of Crisis

In the moments leading up to the killing spree, alleged shooter's parents were racing to stop him.
3:33 | 05/26/14

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Transcript for Shooting Rampage in California: Inside the Moment of Crisis
we'll have the scene from across the country on this memorial day in a moment. But first, the alleged shooter. Many getting e-mails of his manifest toe. His mother alerted something terribly wrong. She got into her car calling police' along the way. And a search for clues tonight. The boxes of evidence removed from the suspect's home. His own words. How he described the visits from investigators just a few weeks back. Why he was relieved they didn't come inside that front door. We have team coverage from the scene in California. And ABC is on the scene tonight. Reporter: Good evening to you. I'm outside a deli where students had to duck for cover to save their lives. This is a growing memorial. We are learning more about the chilling manifest toe that you mentioned. Elliot Rodgers, his family, his friends, including his own mother. I will punish all of you for it. Reporter: Elliot Rodger's deadly plan was already in motion at 9:17 P.M. Friday when his mom's phone range. A family friend says stfs the shooter's therapist asking if he had read the e-mail. 141 pages pouring from his tortured mind. Painful teen-age years and an elaborate plot to kill. Alarmed, the mother's checks her son's youtube channel. Well, this is my last video. It all has to come to this. Reporter: Immediately she calls her ex-husband Hollywood director peter roger, and they race to Santa Barbara, but it's too late. The first reports of a mass shooting under way at 9:27 P.M. Shots fired! Reporter: The first target a skroirty. Revenge against all the girls he says rejected him. They rejected me and looked down on me as an inferior man. Reporter: He bangs on the door. When nobody answers he shoots three women across the street killing two. His rampage continues. 9:30 P.M. He opens fire at this deli filled with students. Surveillance video shows people diving for cover. There's glass flying and I got on the ground and I looked over and I saw the victim. Reporter: The minutes that follow filled with carnage. Roger and his black BMW drives on plowing down bikers. Shooting at pedestrians. He looked directly at me and talked to me and shot at me multiple times and somehow he didn't hit me. Reporter: 9:33:00 P.M. Roger and police in a gun fight. The killer drives away but then crashes his BMW apparently turning the gun on himself. In all, 12 different crime scenes, 13 wounded, three shot dead. And at roger's apartment police still had one more discover to make. His two roommates and one of their friends stabbed to death. We now know that roger had three guns in his possession. 400 rounds of ammunition. And police telling us he obtained all of those guns legally. Thank you.

This transcript has been automatically generated and may not be 100% accurate.

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