Within four minutes of the shooting at Rockville’s Wootton High School, the principal placed the campus on lockdown and a staffer called 911, according to a report on the incident released to families Wednesday.

The report outlines what happened after a shooting in a campus stairwell, providing the clearest picture yet of the Feb. 9 incident, in which a 16-year-old was injured. The victim was taken to recover at a hospital, and the suspect, a fellow student, was charged with attempted second-degree murder.

In the 56-page After-Action Report, district officials commend the response of law enforcement and campus staff, including the school nurse who rendered first aid to the injured student.

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