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Nikolas Cruz brandishing what appears to be an air soft pistol in an Instagram post from 2015.
Nikolas Cruz brandishing what appears to be an air soft pistol in an Instagram post from 2015.

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    Shooter showed violence and mental instability

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Shooter showed violence and mental instability

Starting years before Nikolas Cruz opened fire at his former high school, his mother had repeatedly called police about his violent behavior and threats. CNN's Drew Griffin reports.

Shooter showed violence and mental instability

Starting years before Nikolas Cruz opened fire at his former high school, his mother had repeatedly called police about his violent behavior and threats. CNN's Drew Griffin reports.