Pakistan has condemned an alleged U.S. drone strike that killed three people in the country's tribal region, near the Afghan border on Monday.
In a statement, Pakistan's Ministry of Foreign Affairs said "these unilateral strikes are a violation of Pakistan's sovereignty and integral territory."
Pakistani officials say Monday's strike took place in the Boya area of North Wazirstan, a known stronghold of Taliban and al-Qaida linked militants.
U.S. drone strikes are deeply unpopular in Pakistan and the U.S. does not confirm or deny specific drone actions.
Pakistan says drone strikes are counter-productive and may have a negative impact on the U.S.-Pakistan relations. But U.S. officials say the strikes are an important tool in taking out the insurgents.
The U.S. has decreased the frequency of the drone strikes in recent months.