Police in Bend, Oregon, are investigating how a suspect got the gun and ammunition he used during an Oct. 15 shooting at a local elementary school. Three students and a teacher were killed in the attack, and another student and teacher were injured. The teenaged suspect was killed. 

It’s just the latest case of school violence in the U.S., a crisis that has defied easy answers for years. 

CGTN’s Hendrik Sybrandy reports.

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