SEE IT: School shooter Nikolas Cruz freely roams hallways with AR-15 as security, police fumble through chaos and miscommunication

A new report in the Sun Sentinel details the critical minutes leading up to and during February’s mass shooting at Marjory Stoneman Douglas High School in Parkland, Florida; when former student Nikolas Cruz was able to get inside a building at the school and open fire in multiple locations, killing 17 people before escaping the …