Five students were injured in a shooting Tuesday afternoon at Wilmer-Hutchins High School in southeast Dallas when a 17-year-old allegedly snuck into the school and fired “indiscriminately,” according to a state affidavit for the suspect’s arrest warrant.

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.

Dallas police responded just after 1 p.m. to a shooting incident reported at Wilmer-Hutchins High School, located at 5500 Langdon Road. One student told CBS News Texas that she heard seven gunshots. Authorities confirmed at around 2:20 p.m. there was no active threat and that the school campus had been secured.