An officer shot and injured a student at the United States Naval Academy in Maryland during a lockdown started by online threats from a former student.

The midshipman had mistakenly attacked the officer, thinking they were the threat, according to NBC News.

The military school was put on lockdown Thursday, and a building was cleared in response to the anonymous online threats made to the military school, NBC News reported . The Naval Support Activity Annapolis posted about the incident around 5:45 p.m.

The shooting happened after the midshipman hit the officer with a parade rifle used for training, according to NBC News.

The midshipman was hospitalized and is expected to be OK.

A helicopter video showed someone being wheeled out on a stretcher to a waiting state police helicopter

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