The Great Mills High School student who injured two others Tuesday morning was stopped by the school’s armed resource officer.

According to St. Mary’s County Sheriff Tim Cameron, the school resource officer (SRO) fired a round at the shooter, who fired a round in return. The shooter is now dead, Cameron confirmed Tuesday morning, and an investigation will determine whether the SRO’s bullet struck the shooter.

The incident is now over, though the shooter managed to injure two students. One of them is in critical condition in the hospital, Cameron said. The SRO was not injured during the incident.

St. Mary’s Co. Sheriff: 3 students injured at Great Mills HS have been taken to hospitals in DC, Prince George’s County & St. Mary’s Co. Shooter & female student in critical, another student taken to MedSTAR is critical but stable. SRO who stopped shooter was not hurt. @wusa9

— Peggy Fox (@PeggyTV) March 20, 2018

“When the shooting took place, our school resource officer who was stationed inside the school was alerted to the event and the shots being fired,” Cameron said. “He pursued the shooter, engaged the shooter, during which that engagement he fired a round at the shooter.”

“Simultaneously, the shooter fired a round as well.”

St. Mary Co. Sheriff Tim Cameron on shooting at Great Mills HS: shooting happened in hallway; shooter, a student, fired at a female student, another was student hit. Armed school resource ofc, a deputy, exchanged shots w/ shooter; shooter & female student in critical condition

— Peggy Fox (@PeggyTV) March 20, 2018

Following the horrific tragedy in Parkland, Florida, President Trump has repeatedly called for arming up to 20 percent of school staff members as a means to safeguard students and prevent future mass shootings.

“If schools are mandated to be gun free zones, violence and danger are given an open invitation to enter,” POTUS has maintained. “Almost all school shootings are in gun free zones. Cowards will only go where there is no deterrent!”