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Before and during Parkland shooting, authorities failed to step in

Nikolas Cruz.
Photo: Mike Stocker-Pool / Getty Images

In the aftermath of the Marjory Stoneman Douglas High School shooting that left 17 dead, we've learned of several instances in which authorities failed to step in both before and during the attack.

Why it matters: The more we learn, the clearer it is that the system in place to prevent such tragedies failed.