GREAT MILLS, Md. (WBFF) – Frightening moments at Great Mills High School are detailed in a newly-released timeline of the incident, which shows both the movements of the shooter and the school resource officer.

Also released Monday night are 911 calls, including a call from a 14-year-old boy who was shot in the hallway.

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http://foxbaltimore.com/news/local/911-calls-i-was-just-shot-at-my-school