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PARKLAND, FL - FEBRUARY 14:  People are brought out of the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene.  (Photo by Joe Raedle/Getty Images)
PARKLAND, FL - FEBRUARY 14:  People are brought out of the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene.  (Photo by Joe Raedle/Getty Images)

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Sources: 4 armed deputies didn't enter school

Police reveal series of missteps in relation to the shooting at Marjory Stoneman Douglas High School in Parkland, FL. CNN's Randi Kaye has the latest.

Sources: 4 armed deputies didn't enter school

Police reveal series of missteps in relation to the shooting at Marjory Stoneman Douglas High School in Parkland, FL. CNN's Randi Kaye has the latest.