Hours after the shooting, a 17-year-old suspect turned himself in at the Lew Sterrett Justice Center in Dallas and was booked into Dallas County jail at 9:32 p.m., online records show. The teen was being held on an aggravated assault mass shooting charge with a $600,000 bond, according to records.

Hours after the shooting, officials said the suspect, who has yet to be apprehended, had evaded security protocols at Wilmer-Hutchins High School.