Speaking at a news conference, St. Mary's County Tim Cameron says the male student was armed with a handgun Tuesday morning when he wounded a female student and a male student just before classes began at Great Mills High School in southern Maryland.
A YouCaring page set up for Barnes raised more than $10,000 by Wednesday morning. Jaelynn Willey remains in critical condition at a hospital.
Sen. Benjamin Cardin, D-Md., said, "having a trained, professional school resource officer made a difference. armed school resource officers are available in our high schools and that's important". "The shooter fired a round as well".
It occurred amid a re-energized national debate over school shootings in the United States following an attack on February 14 at Marjory Stoneman Douglas High School in Parkland, Florida, where a gunman killed 17 students and faculty.
The wounded girl was listed in critical condition at Prince George's Hospital Center, the sheriff said during a pair of press briefings after the shooting, and MedStar St. Mary's Hospital in Leonardtown reported shortly before midday that the 14-year-old male wounded student was listed in good condition.
"They're all different", Hoyer said of the school shootings that have occurred this year at a rate of "approximately two a week", but he added, "there is a common element".
Deputies are still investigating the motive of the shooting.
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Cameron said Rollins fired a Glock 9-mm gun at a 16-year-old girl and 14-year-old boy. "The officer was not harmed, the sheriff said".
Great Mills High School is in St. Mary's County, which is about 110 km south of Washington.
That massacre sparked a new student movement against gun violence, including a national school walkout last week that Great Mills students participated in. Rollins simultaneously fired a shot, but it's also unclear if he was aiming at the school resource officer.
Further information about Rollins was not immediately available.A Facebook page under the name of "Austin Rollins" depicted a teenager who attends Great Mills High School and is interested in auto racing and kayaking.
One of the shooter's friends, 14-year-old Jordan Hutchinson, and his mother dropped off a condolence card at the Rollins home.
The officer ordered the student to drop the gun again, before two shots sounded, marking the end of the latest school shooting for a nation tired of them.
The sheriff praised the school resource officer, Deputy First Class Blaine Gaskill, a six-year veteran in his first year at the high school, for containing the situation in less than a minute.
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Parents were asked to meet their children at a reunification site on the Leonardtown High School campus, where counselors and other support staff were on hand.
"He had to cover significant ground", Cameron said.
"Our hearts and prayers are with those impacted, and our deep appreciation goes out to the first responders", she wrote on Twitter.
"All my daughter said is she was hiding", a father said as law officers and rescue crews continued their response. "If you don't think this can happen at your school you are sadly mistaken".
A high school student was shot in the parking lot of Oxon Hill High.
Agents from the federal Bureau of Alcohol, Tobacco, Firearms and Explosives were headed to the scene.
"We don't want to make any assumptions". My school is on a very real lockdown threat and there's already someone possibly dead.
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In the Parkland shooting, school resource deputy Scot Peterson never entered the building after taking a position outside.