The threatening call was made at about 7:20 a.m. and the caller hung up after making the threat, police said.

Later in the day, the school sent a second message to parents.

"While normal school operations have resumed, and students and staff are continuing with their day, Chesterfield Police will have a presence at school," it read.

Police have not yet released additional information about the investigation.

Message #1

Message #2

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