The U.S. Naval Academy is on lockdown after a midshipman who had been kicked out of the school returned to campus armed with a weapon, multiple sources inside the U.S. Naval Academy tell Fox News.

Gunshots were heard inside Bancroft Hall, which houses the midshipmen. One victim was transported via medical helicopter, and multiple other victims were being assessed. 

However, according to an internal email obtained by Fox News from Capt. David Forman, deputy commandant of midshipmen, a midshipman mistook authorized law enforcement as a threat, engaged and was injured in the process. The email said the midshipman is stable and receiving medical attention.

One official on campus said, “The shooter is knocking on doors pretending to be a military policeman.”

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“Secretary Phelan is aware of the situation and has been receiving up-to-the-minute updates from NCIS and USNA leadership. USNA is on lockdown out of abundance of caution,” a Navy official told Fox News Digital. “This is an ongoing situation, and we will provide updates as they become available.”

“Naval Support Activity Annapolis, in coordination with local law enforcement, is currently responding to reports of threats made to the Naval Academy,” NSAA PAO, Lt. Naweed Lemar, told Fox News. “The base is on lockdown out of an abundance of caution. This is a developing situation, and we will provide updates as they become available.”

A Defense Department official also confirmed the agency is aware of the lockdown at the campus, adding officials “are monitoring the situation with the Navy. Secretary Hegseth has been briefed.”

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Authorities patrol a sidewalk along the waterfront at the U.S. Naval Academy in Annapolis, Md., amid reports of an active threat on campus Sept. 11, 2025. (WTTG)

A former student told Fox News Digital how “horrible” it must feel for the midshipman locked inside since the building always felt like “home” and houses around 4000 or more individuals.

“It’s definitely obviously horrible because the school is very close. The common phrase that you’ll hear midshipmen describe Bancroft Hall is that you live and work there,” the former student said.

Armed officers walk along a sidewalk near a building at the U.S. Naval Academy in Annapolis, Md., after reports of a threat and gunfire prompted a lockdown Sept. 11, 2025. (WTTG)

“So, it’s, it’s both your home and your workplace,” the former student added before describing how secure the hall is. “There’s really two main security checkpoints manned 24/7, by armed guards.

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“The only form of security is CAC readers, so, theoretically, you can’t get in unless you have a CAC or someone just like leaves the door open.”

This is a developing story.