Secret US drone base in Saudi Arabia revealed
6 February 2013 Last updated at 20:03 GMT
The US Central Intelligence Agency has been operating a secret airbase for unmanned drones in Saudi Arabia for the past two years.
The facility was established to hunt for members of al-Qaeda in the Arabian Peninsula, which is based in Yemen.
The US media had known of its existence, but had not reported it until now.
The BBC's security correspondent Gordon Corera reports.