Washington Post 
Dec 1, 2012
The April wreck was the latest in a rash of U.S. military drone crashes at overseas civilian airports in the past two years. The accidents reinforce concerns about the risks of flying the robot aircraft outside war zones, including in the United States .
A review of thousands of pages of unclassified Air Force investigation reports, obtained by The Washington Post under public-records requests, shows that drones flying from civilian airports have been plagued by setbacks.
Among the problems repeatedly cited are pilot error, mechanical failure, software bugs in the “brains” of the aircraft and poor coordination with civilian air-traffic controllers.
On Jan. 14, 2011, a Predator drone crashed off the Horn of Africa while trying to return to an international airport next to a U.S. military base in Djibouti . It was the first known accident involving a Predator or Reaper drone near a civilian airport. Predators and Reapers can carry satellite-guided missiles and have become the Obama administration’s primary weapon  against al-Qaeda and other terrorist groups.