A teenage girl and an adult woman were killed and seven other people were injured in a shooting at a south St. Louis high school Monday morning. The suspect is dead.

Interim St. Louis Police Chief Michael Sack said the suspect was killed in an exchange of gunfire with police. The suspect reportedly had a long gun.

Sack told Fox 2 the shooting happened shortly around 9:10 a.m. Officers arrived at the school just minutes later and immediately made entry into the building.

Sack said the school was closed and the door locked. He said the school’s security team immediately notified police when the suspect, a 20-year-old male, attempted to gain entry, but he would not discuss how the suspect was able to get in.

The injuries were caused by gunshot, shrapnel, and/or cardiac arrest, St. Louis Public Radio reports.

The names of the suspect and the victims have not been released.