Freese said the school had held drills a couple of times for this kind of situation.
Attempts to reach his family have been unsuccessful.
The girl was in critical condition with life-threatening...
"They came in with guns, and they probably thought there might be another shooter, of course", she said.
The shooting happened just weeks after a deadly attack on a high school in Parkland, Fla., that killed 17 people.
Authorities said Jaelynn Willey was targeted by 17-year-old Austin Wyatt Rollins Tuesday at Grand Mills High School near Washington, D.C. She and a 14-year-old boy were wounded by the gunfire. The resource officer was not injured.
Rollins died after a confrontation with the officer.
Investigators are still working to determine which bullets struck which individuals.
The 14-year-old victim was discharged from the hospital Wednesday.
Federal agents are completing an urgent trace request by the St. Mary's County Sheriff's Office for the history of a semi-automatic Glock handgun that law enforcement says Austin Rollins used at his southern Maryland high school.
The sheriff announced at the press conference that the gunman died about two hours after shooting. Specifics would include the make, model and serial number of the firearm.
"We should be having a school walkout to commemorate all the kids that got to walk out of school today thanks to Deputy Blaine Gaskill and his gun", wrote Twitter poster Emily Horst Weaver, whose picture shows her firing a gun. Teachers' union leaders issued statements Tuesday saying more policies must be changed nationwide to keep schools safe. Authorities have not released his name. The 16-year-old girl was stabilized and transferred to UM Prince George's Hospital Center, Medstar said.
Willey's family requested prayers and privacy.
In a shooting that lasted less than a minute, Rollins opened fire with a handgun. The officer was not wounded.
Ramzziddin was fatally shot when he was off duty and helping a neighbor who had asked for his assistance in a domestic dispute, police have said.
Cameron indicated that Rollins and Willey may have possibly been in a previous relationship. Another boy, 14, also was injured. The FBI's Baltimore office also said they are on the scene, assisting local authorities.
The officer then engaged with the gunman, and each fired one shot simultaneously, the sheriff said.
Great Mills High, where the incident occurred, has about 1,600 students and starts its school day at 7:45 a.m., school officials said.
The group estimates only 20 percent of the nation's schools have a school resource officer, which the association defines as "a properly selected, specially trained sworn police officer".
Emma Gonzalez, a senior at Stoneman Douglas High School who survived last month's shootings, wrote on Twitter, "We are here for you, students of Great Mills, together we can stop this from ever happening again". "We are Here for you, students of Great Mills", Gonzalez said. It wasn't clear whether he shot himself or was shot by the school resource officer who responded.
St. Mary's County Sheriff Tim Cameron credited the officer with preventing any more loss of life.
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