Florida school's security cameras were rewound 20 minutes, causing lag in capturing gunman, officials say

Police officers responding to last week’s Florida school shooting thought they were tracking Nikolas Cruz live on surveillance video — but then realized the footage was delayed by nearly 30 minutes because it was rewound, tossing roadblocks into the frantic efforts to capture the 19-year-old shooting suspect.
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 http://www.foxnews.com/us/2018/02/23/florida-schools
 http://www.sun-sentinel.com/local/broward/parkland/