The school shooter has been identified as 17-year-old student, Austin Wyatt Rollins. St. Mary’s County sheriff said at a news conference Tuesday afternoon that the school resource officer, Special Agent Blaine Gaskell, who is a member of SWAT, spotted the gunman in the hallway at Great Mills High School and fired a single fatal shot. Almost simultaneously, Rollins fired back, investigators said.

(Original story:)  Maryland officials have released little information in an incident that injured three students in a shooting at Great Mills High School in St. Mary’s County, south of Washington, D.C.

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TheCount.com has learned the shooter attended the school. It is not known if the student is currently enrolled. Another report showed a school resource officer “responded to the threat.” source

Authorities told an affiliate WJLA that at least three students have been injured, including the shooter; their conditions have not yet been released.

St. Mary’s County Sheriff’s Office had the incident contained around 8:45 a.m.

Developing.