(NEWSER) – When Elliot Rodger's parents realized just how dangerous their disturbed son was, they made a desperate attempt to try to stop him. They received a copy of his 141-page manifesto and saw a YouTube video outlining his plans for his "Day of Retribution" on Friday night and called 911 before rushing to Santa Barbara in separate cars, a family friend tells the New York Daily News. They heard about the shooting spree while they were on their way. "They were hoping against hope," the friend says. "They are in inconceivable pain.