Tragedy struck in Colorado on September 10, as a school shooting unfolded at Evergreen High School, which is located in the small town of Evergreen and about 18 miles southwest of downtown Denver.

Here are 7 things to know about that tragic event:

1. The shooting started around 12:30 p.m., with the first emergency alert report about the shooting sent out about 30 minutes later, per a report from Denver Gazette.
2. A male teen was responsible for the shooting, with that teen dying of self-inflicted injuries on Wednesday night. The suspect has since been identified as 16-year-old Desmond Holly.
3. The alleged shooter was one of three students who were critically injured in the incident, with injured students transported to a local hospital. All of those injured were minors.
4. The weapon used in the shooting was a handgun described as a revolver. The suspect reportedly reloaded to fire more rounds multiple times.
5. The response involved more than 100 law enforcement personnel, with the school evacuated cleared about an hour and a half after the first report of the incident. A School Resource Officer was not at the scene when the shooting started, with Evergreen High School having several part-time SRO’s manage the facility while the full-time SRO is on medical leave.
6. An official motive related to the shooting has not yet been released. Some sources indicate the boy was influence by an “extremist group.”
7. Evergreen is an unincorporated town located in mountainous terrain with a population of about 9,307 people, though more live in the surrounding area. The student population at the high school involved in the shooting was listed as 931 during the 2023-2024 school year.