A police officer shot two men attempting to ram a gate at the National Security Agency headquarters at Fort Meade, Maryland, Monday morning.

NBC Washington reports:

One person is dead after a security guard exchanged gunfire with two men who tried to enter the facility disguised as women.

The guard got into an altercation with the men outside the gate for the NSA side of the Maryland Army installation just before 9 a.m. Monday.

Gunfire was exchanged, and it is believed that the guard shot at least one of the men.

At least one gun and drugs were found in the stolen Ford Escape the men were riding in, according to NBC News.

Subsequent reports detailed that NSA officers opened fire on the vehicle after it accelerated toward an NSA police vehicle blocking the road. The car then crashed into the NSA vehicle.

Authorities have confirmed that one of the gunmen is dead and the other seriously wounded. 

NBC News reports that a senior official said that no other federal agencies are involved as the incident appears to be a "local criminal matter." The Huffington Post notes that the gate which the two men attempted to enter is not near the main NSA buildings.

A local Fox News affiliate provided some aerial shots of the scene:

UPDATE: The Washington Post reports that, contrary to early reports, the FBI are involved in the investigation. FBI spokeswoman Amy J. Thoreson said in a statement that authorities "do not believe [the incident] is related to terrorism." Thoreson said that President Obama and Deputy White House press secretary Eric Schultz have been briefed on the attack.

Officials have also confirmed that one of the NSA officers involved in the incident was injured.