The sheriff of Saint Mary's County says another victim is in critical condition and a third has been hospitalized.

The armed school resource officer who stopped the shooter is unharmed according to officials.

The shooting happened Tuesday morning at Great Mills High School in Saint Mary's County which is located in southeastern Maryland.

While on lockdown, one student tweeted asking for prayers.

Mollie Davis (Tweet):

@davism0llie
Hi Twitter. I am in Great Mills HS. My school is on a very real lockdown threat and there's already someone possibly dead. Please pray for us.

According to a statement on the school system's website the shooting was quickly contained.

The sheriff's asked parents to stay away from the campus, reporting instead to Leonardtown High School.

Governor Larry Hogan (Tweet):

@GovLarryHogan
We are closely monitoring the situation at Great Mills High School. @MDSP is in touch with local law enforcement and ready to provide support. Our prayers are with students, school personnel, and first responders.

Police continue to investigate the shooting, including the shooter's motive...

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