In 2001, the White House concluded that it was legal to use armed drones to kill senior al-Qaeda leaders. Within weeks of the 9/11 attacks, then-US President George W Bush signed off on an order which authorized the Central Intelligence Agency (CIA) to capture and kill al-Qaeda operatives.
For some, drones are the greatest weapon ever to be developed by the CIA; for others, they present a constant, deadly and terrifying threat.
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