The use of U.S. drones in Pakistan has been controversial, with campaigners claiming the majority of those killed were civilians, despite U.S. claims that drone strikes were precise and only killed militants.
Of more than 3,400 people killed in Pakistan by drone strikes, human rights groups say 70 percent were civilians.
Though Islamabad has publicly opposed the U.S. drone strikes, calling them a violation of its sovereignty, many believe the two countries share a tacit agreement on the unmanned operations that focus mainly on the norhtwestern tribal belt.
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