@CNN: Surveillance video has been released from security cameras outside Marjory Stoneman Douglas High School on the day a gunman killed 17 people https://t.co/W6io54HXZL https://t.co/S9TvKdIAir

@CNN: Surveillance video has been released from security cameras outside Marjory Stoneman Douglas High School on the day a gunman killed 17 people https://t.co/W6io54HXZL https://t.co/S9TvKdIAir