The gunman who killed four people and critically wounded a fifth at a Orange, Calif. office building knew all the victims and apparently before opening fire chained shut the gates to two entrances, delaying police from getting inside, authorities said Thursday. Among the victims of the “horrific massacre” Wednesday afternoon was a nine-year-old boy who was found cradled in the arms of a woman believed to be his mother, Orange County District Attorney Todd Spitzer said.
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