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Police and EMS Response to Maryland Shooting

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High School Shooting Maryland

People gather outside the entrance to Frederick High School following a shooting in Frederick, Md., Wednesday, Feb. 4, 2015. Police and school officials said students were shot outside the school while a basketball game was being played inside. (AP Photo/The Frederick News-Post, Bill Green)

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High School Shooting Maryland

Officials enter Frederick High School, Wednesday, Feb. 4, 2015, in Frederick, Md. Police and school officials said students were shot outside the school while a basketball game was being played inside. (AP Photo/The Frederick News-Post, Bill Green)

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High School Shooting Maryland

Frederick police Capt. Richard L. Hetherington talks to the media about a shootings outside Frederick High School, Wednesday, Feb. 4, 2015, in Frederick, Md. Police and school officials said students were shot outside the school while a basketball game was being played inside. (AP Photo/The Frederick News-Post, Sam Yu)

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High School Shooting Maryland

A patient is brought to a helicopter following a shooting outside Frederick High School, Wednesday, Feb, 4, 2015, in Frederick, Md. Police and school officials said students were shot outside the school while a basketball game was being played inside. (AP Photo/The Frederick News-Post, Bill Green)