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ST. MARY’S COUNTY, Md. — A shooting was reported Tuesday morning at a high school in Maryland.

The shooting happened at 7:45 a.m. in a hallway at Great Mills High School in St. Mary’s County. Great Mills is about 60 miles southeast of Washington, D.C.

According to WJLA, at least three students have been injured, including the shooter, who used a handgun.

St. Mary’s County Sheriff Tim Cameron said a school resource officer engaged the shooter and ended the threat, and the shooter was pronounced dead. A male student is in stable condition and a female student is in critical condition, he said.

The school resource officer fired a round at the shooter, and the shooter fired a round as well, but the officer was not injured.

St. Mary’s County Public Schools wrote on its website, “There has been a shooting at Great Mills High School.” They also said “the school is on lockdown and the event is contained.”

Jonathan Freese, a student at Great Mills, told CNN he was on lockdown in his math class. Police were going through classrooms to clear the school.

“I’m still a little shaken up,” he said.

Parents were asked to report to nearby Leondardtown High School to be reunited with their students.

Great Mills High School has an enrollment of just over 1,500 students, according to the school’s 2015-16 improvement plan.