The gunman behind the second-deadliest US mass shooting of the year was terminated from the Army due to health concerns and may have been driven by right-wing extremism, sources told CNN.Eight people - including two elementary school students - were killed after Saturday's deadly attack at Allen Premium Outlets, a bustling mall in the affluent Dallas suburb of Allen.Authorities say Mauricio Garcia used an AR-15-style weapon to carry out the massacre before he was gunned down by a police officer.
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