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PARKLAND, FL - FEBRUARY 15:  Students, friends, and family members gather around candlit crosses during vigil for victims of the mass shooting at Marjory Stoneman Douglas High School yesterday, at Pine Trail Park, on February 15, 2018 in Parkland, Florida. Yesterday Police arrested 19 year old former student Nikolas Cruz for killing 17 people at the high school.  (Photo by Mark Wilson/Getty Images)
PARKLAND, FL - FEBRUARY 15:  Students, friends, and family members gather around candlit crosses during vigil for victims of the mass shooting at Marjory Stoneman Douglas High School yesterday, at Pine Trail Park, on February 15, 2018 in Parkland, Florida. Yesterday Police arrested 19 year old former student Nikolas Cruz for killing 17 people at the high school.  (Photo by Mark Wilson/Getty Images)

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Student: Somebody's pushing on door

Students called 911 before opening doors.

Student: Somebody's pushing on door

Students called 911 before opening doors.