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Stoneman Douglas Teacher: 'The kids needed me,' so I did not cry

03:07

Stoneman Douglas High School teacher Melissa Falkowski recounts the harrowing experience of hiding from a teenage gunman who laid siege to her school, killing 17. Falkowski believes that regardless of the FBI's failure to follow up on a possible tip-off to the suspect, he should not have had access to an AR-15 in the first place.