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Google Earth view of Great Mills High School in Great Mills, Md. Authorities say a shooting at the high school Tuesday wounded three people, including the shooter. A sheriff's spokeswoman said the situation was "contained" as deputies and federal agents converged on the crime scene. (Google Earth)

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*Update* - Sheriff: 1 student dead, 2 wounded in Maryland high school

A teenager with a handgun shot a girl and boy inside his Maryland high school Tuesday before he was fatally wounded during a confrontation with a school resource officer, a sheriff said.