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Great Mills High School in Great Mills, Maryland, is on lockdown after a shooting there this morning, St. Mary's County Public Schools said in a statement. SUBSCRIBE to ABC NEWS: https://www.youtube.com/ABCNews/ Watch More on http://abcnews.go.com/ LIKE ABC News on FACEBOOK https://www.facebook.com/abcnews FOLLOW ABC News on TWITTER: https://twitter.com/abc GOOD MORNING AMERICA'S HOMEPAGE: https://gma.yahoo.com/

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Great Mills High School in Great Mills, Maryland, is on lockdown after a shooting there this morning, St. Mary's County Public Schools said in a statement. SUBSCRIBE to ABC NEWS: https://www.youtube.

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Great Mills High School in Great Mills, Maryland, is on lockdown after a shooting there this morning, St. Mary's County Public Schools said in a statement. SUBSCRIBE to ABC NEWS: https://www.youtube.

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Great Mills High School in Great Mills, Maryland, is on lockdown after a shooting there this morning, St. Mary's County Public Schools said in a statement. SUBSCRIBE to ABC NEWS: https://www.youtube.

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Great Mills High School in Great Mills, Maryland, is on lockdown after a shooting there this morning, St. Mary's County Public Schools said in a statement. SUBSCRIBE to ABC NEWS: https://www.youtube.

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Great Mills High School in Great Mills, Maryland, is on lockdown after a shooting there this morning, St. Mary's County Public Schools said in a statement. SUBSCRIBE to ABC NEWS: https://www.youtube.

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Great Mills High School in Great Mills, Maryland, is on lockdown after a shooting there this morning, St. Mary's County Public Schools said in a statement. SUBSCRIBE to ABC NEWS: https://www.youtube.