A gunman who opened fire at a southern dental office, killing one and injuring to others, was a former disgruntled patient, police have revealed.Mohammed Abdulkareem, 29, was arrested on Thursday after a desperate hours-long search following the shooting at the Smile Plus Dentistry & Orthodontics in El Cajon, a city about 15 miles northeast of San Diego. Police said on Friday the suspect legally purchased the gun he used in the attack just two weeks ago. An exact motive for the shooting remains unclear.
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