A CIA spokesperson said security staff “engaged a person” outside the main gates, and a source familiar with the matter said the suspect was a woman.

The spokesperson declined to say whether gunfire struck the suspect or to disclose any other details of the incident, except to say the person was now in custody.

NBC News reported earlier that the person was shot, citing a person with knowledge of the matter.

It was not immediately known why security officers opened fire or what the person was doing at the time of the shooting.

The incident occurred around 4am (0800 GMT), a Fairfax police spokesperson told ABC News.

The CIA closed the main gate at its Langley compound and directed employees to seek alternate routes.

The shooting incident came after two Israeli Embassy staffers were killed by a lone gunman in downtown Washington on Wednesday night. There was no indication the incidents were related.