'Horrific massacre': Suspect locked entries in shooting at California office building that left 4 dead, including 9-year-old boy

A targeted attack that left four dead, including a 9-year-old boy, at a Southern California office building marked the third time in less than three weeks the country has been rocked by a mass shooting.

Police say the suspect in the Wednesday evening massacre knew his victims and locked gated entryways into the office suite in Orange, about 30 miles south of Los Angeles, before opening fire. Victims were found in various areas of the building, including the boy, who was found dead in the arms of a woman believed to be his mother, officials said. 

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