The sister of a hero police officer who gunned down the Covenant School shooter in Nashville said her heart 'shattered into a thousand pieces' when she learned about the tragedy.Deanna DeHart, the older sister of Michael Collazo - one of two officers who and three staff members - said her brother and his colleagues 'saved a lot of lives' through their quick response.She also gave a moving tribute to the victims as more harrowing images emerged of children fleeing the school during the shooting. A group of young children were filmed being led across a road away from the school after they escaped the building during the attack.
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