The teenage boy who shot up a high school on Tuesday was let in by another student, according to an arrest affidavit.
Tracy Haynes Jr., 17, has been charged with aggravated assault after he at Wilmer Hutchins High School in Dallas.
Surveillance video obtained by CBS News captured the moment Haynes entered the school hallway. He was let in by a student using an 'unsecured door' just after 1pm, according to his arrest affidavit.
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