GREAT MILLS, Md. (AP) - UPDATE: A sheriff says the shooter at a Maryland high school has died after a school resource officer fired at him.
St. Mary's County Tim Cameron told a news conference Tuesday morning that the shooter and the officer both fired a round and it wasn't known if the officer's bullet killed the suspect.
Cameron says a female student and a male student were also wounded in the shooting in a hallway at Great Mills High School in southern Maryland.
School officials report that there's been a shooting at a Maryland high school, that the 'event is contained' and the campus is on lockdown.
ABC affiliate WJLA, reports the shooter was a student and one of the three injured. Two others injured were students. WJLA also says a school resource officer took action to end the threat.
The St. Mary's County Public Schools said on its website early Tuesday that there was a shooting at Great Mills High School, located in the southern end of the state.
The office of the county sheriff said there was an "incident" at the school, and asked parents to stay away from the campus, reporting instead to Leonardtown High School instead.
The school is in the congressional district of Rep. Steny Hoyer, who tweeted that he's closely monitoring reports and urged people to follow the instructions of local law enforcement at the scene.
#BREAKING: @ABC7Brad says sources tell him the Great Mills HS shooter was a student and is one of the three injured. Two others injured were also students. Bell also says a school resource officer took action to end threat. https://t.co/EubIrvcnOi pic.twitter.com/DLmrne6cDs— ABC 7 News - WJLA (@ABC7News) March 20, 2018