Two students were injured and the suspected gunman died in a shooting at Great Mills High School in Maryland on Tuesday.

As CrimeOnline previously reported, St. Mary’s County Sheriff Timothy Cameron identified the shooter as 17-year-old Austin Wyatt Rollins, who died after being treated at a hospital for injuries.

A 16-year-old girl and and a 14-year-old boy were shot, and the girl reportedly suffered life-threatening injuries.

Sheriff Cameron said in a news conference Tuesday afternoon that Deputy First Class Blaine Gaskill, 34, a School Resource Officer assigned to Great Mills, engaged with the shooter, and that Rollins quickly returned fire. Deputy Gaskill was not injured in the exchange, and Sheriff Cameron said that investigators are still working to determine if Rollins was injured by the SRO’s weapon or his own.

The sheriff praised the response of the school’s lone SRO, whose quick action may have prevented further tragedy.

“He responded exactly how we train our personnel to respond,” Sheriff  Cameron told reporters.

WTOP reports that the sheriff’s department ordered an emergency trace of the gun that Rollins allegedly used in the shooting, which Sheriff Cameron confirmed was a Glock semi-automatic handgun.

Bureau of Alcohol, Tobacco, Firearms and Explosives is working to determine previous ownership of the gun and how it made it into the alleged shooter’s hands.

ATF agent Amanda Hils told WTOP that an emergency trace can be completed in as little as 24 hours.

“The information about the firearm including the make, model and serial number has been submitted to ATF’s National Tracing Center. And they are requesting to know who the initial purchaser of the firearm was.”

Authorities have not publicly identified the victims of the shooting. CrimeOnline will provide further updates when more information is available.

[Feature image: Deputy First Class Blaine Gaskill/St. Mary’s County Sheriff]