(NASHVILLE, Tenn.) — Three children and three staff members were shot and killed at a private school in Nashville, Tennessee, according to officials.

The shooting unfolded Monday morning at the Covenant School, a Christian school for students in preschool through sixth grade.

The female suspect, who appeared to be in her teens, was shot and killed by authorities in a lobby area on the second floor of the school, police said at a news conference.

No one who was shot survived, officials said.

The suspect entered the school through a side entrance and was armed with at least two assault-type rifles and a handgun, officials said. She has not yet been identified, police said.

Alex Apple told ABC News Live that his mother works at the school’s front desk. Apple said she was at her car when she got an alert saying to shelter in place.

“She got out of her car, heard the gunshots, so she fled,” he said.

The school has about 209 students and about 40 to 50 staff members, officials said.

First lady Jill Biden briefly addressed the shooting at the top of her remarks at the National League of Cities conference on Monday.

“I am truly without words. Our children deserve better,” she said.

Tennessee Gov. Bill Lee tweeted that he’s “closely monitoring the tragic situation.”

“Please join us in praying for the school, congregation & Nashville community,” Lee said.

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