A shooting at a high school in St. Louis left three students dead and six injured after a man approached the school and tried to get inside.

According to the Associated Press, officers responded quickly after security grew concerned about the gunman’s attempts to get into the school.

Sack said security officials initially became alarmed when the shooter tried to get into the locked school building. He declined to say how the man got inside, armed with what he described as a long gun.

Officers “ran to that gunfire, located that shooter and engaged that shooter in an exchange of gunfire,” killing him, Sack said.

Sack declined to name the victims and did not say if the woman who was killed was a teacher.

Six other injured people were hospitalized. Sack said some suffered gunshot wounds, while others were struck by shrapnel. He did not provide any information on their conditions.

Massive police presence at Cleveland School at the intersection of Arsenal and Kingshighway in St. Louis. Three people injured. #breaking #breakingnews pic.twitter.com/PoTyIKdDTz

— FOX2now (@FOX2now) October 24, 2022

The shooter and the victims have not been identified at this time.

During the course of the investigation, the school was shut down and the St. Louis Public School District tweeted that students were being evacuated from the school. Around 11 a.m., police said the scene was secure and that there was no active threat.

St. Louis Fire Chief Dennis Jenkerson told a local news station that he “heard the calls and hoped it wasn’t correct,” He also said the department has trained for active shooter situations and highlighted the police department’s response.

“The response from the police department was more than impressive,” he said. “The job that they did provided an impactful ending.”