Tracy Haynes, 17, was booked into Dallas County Jail at 9:32 p.m. and is facing a charge of aggravated assault mass shooting. The arrest came after four students were injured in a school shooting Tuesday afternoon, about a year to the day when gunfire erupted on the same campus.

The chief of police for the Dallas Independent School District says the student who shot four students when he opened fire at a Dallas high school this week was in and out of the building in less than two minutes and is believed to have been targeting a specific student.