There has been a shooting at a high school in Maryland with possible casualties, according to multiple local reports.

The reported shooting is at Great Mills High School in St. Mary’s County, south of Washington, D.C.

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The incident would come just over a month after a mass shooting at a Florida high school left 17 people dead.

WJLA says the incident has been “contained.”

A Twitter user who says they are in Great Mills says the school is in lockdown at “there’s already someone possibly dead. Please pray for us.”