Dallas high school shooting update: Full press conference

Police provided an update on Thursday afternoon regarding the Dallas school shooting that took place on Tuesday. According to an official arrest warrant, the 17-year-old student accused of injuring four in the high school shooting was let into the building through an unsecured door and then walked down a hallway toward a group of students, opening fire on them before appearing to take a point-blank shot at one. The suspect was taken into custody several hours after the shooting. The suspect was being held in Dallas County Jail on Wednesday on a charge of aggravated assault mass shooting.