'Pursued ... Engaged ... Fired': Armed School Resource Officer Engages Maryland High School Shooter Resulting In Zero Fatalities.

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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.

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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!"

WATCH - CNN Speculates On Maryland Shooting:

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