CNN reports that a 17-year-old male student shot two other students at Great Mills High School in Maryland on Tuesday morning before a school resource officer engaged him and stopped the threat.
The incident began in a school hallway at 7:55 a.m., just before classes started. Authorities say Austin Wyatt Rollins, armed with a handgun, shot a female and a male student.
St. Mary’s County Sheriff Tim Cameron said the shooter had a prior relationship with the female student.
School resource officer Blaine Gaskill responded to the scene in less than a minute, the sheriff said. Gaskill fired a round at the shooter, and the shooter fired a round simultaneously, Cameron said.
Rollins was later pronounced dead. Gaskill was unharmed.
The incident is the 17th school shooting in the United States since January 1, according to CNN research.
The school was on lockdown for a brief time, and students were evacuated from Great Mills High School to a reunification centre at a nearby high school, the school system said.