A gunman who opened fire at a southern dental office, killing one and injuring to others, knew some of the victims, according to police.Mohammed Abdulkareem, 29, was arrested on Thursday after a desperate hours-long search following the shooting at the Smile Plus Dentistry & Orthodontics on North Magnolia Avenue in El Cajon, a city about 15 miles northeast of San Diego.The office's receptionist Yareli Carrillo, 28, was shot in the legs but is in stable condition and expected to survive.
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