Analyse @nbcwashington's tweets
@nbcwashington
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A shooting investigation is underway at Great Mills High School in Great Mills, Maryland. Multiple injuries have been reported. The shooting comes just four days before the national #MarchForOurLives. https://t.co/MgNIB5ZJJd
Photo via News4 viewer. https://t.co/t4un4koc08
Photo via News4 viewer. https://t.co/t4un4koc08