Area police in northern Virginia have said there is an "ongoing" security incident at the headquarters of the Central Intelligence Agency, where a vehicle reportedly attempted to enter the premises on Monday afternoon.
The CIA said in a statement that its compound had remained secured, and its Security Protective Officers were "the only Agency personnel directly involved" in the incident.
Initially, security personnel were said to be negotiating with the suspect who had got out of his auto together with a weapon.
"The subject was wounded and has been transported to a hospital for medical attention", the Federal Bureau of Investigation said.
According to an NBC News report, the intruder tried to breach a gate that was manned by armed guards and refused to initially leave his vehicle.
Officers from the Fairfax County Police were on site managing traffic around the heavily guarded main entrance to the agency, about 10 miles from Washington D.C.
Officials familiar with the matter, speaking on the condition of anonymity to describe an ongoing probe, said the person had pulled up to the Central Intelligence Agency security gate hours earlier, and the shooting occurred after lengthy negotiations with him.
Hours earlier, he was stopped by armed guards "just outside the secure perimeter of CIA Headquarters by our main gate" on a major causeway, State Route 123, the CIA told Fox News.
The CIA has been the target of attacks in the past.
In 1993, a Pakistani man, Mir Aimal Kansi, shot and killed two agency employees and wounded three others as they sat in their cars waiting at a stoplight to enter the compound.
Kansi had escaped back to Pakistan and was found and arrested four years later. No shots were fired by the suspect at the time and no agency personnel were injured.