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.
A drone flown from there was used in September 2011 to kill Anwar al-Awlaki, a US-born cleric who was alleged to be AQAP's external operations chief.
US media have known of its existence since then, but have not reported it.
Source: BBC. Read full article. (link)