Condemning the twin attacks last night and this morning, a foreign office spokesperson said, "These strikes are a violation of Pakistan's sovereignty and territorial integrity. Additionally, these strikes have a negative impact on the government's efforts to bring peace and stability in Pakistan and the region."
The drone attack came after a temporary halt of about six months, following a request by Prime Minister Nawaz Sharif to let his government end violence by Taliban through peaceful negotiations.
Drones operated by the CIA fired at least 20 missiles in North Waziristan near Afghan border in successive attacks last night and this morning, killing 16 militants.
A security official said that the morning attack targeted Haqqani network and killed its 10 members in Danday Darpakhel area. Four more militants were injured in the strike.
The overnight attack killed four Uzbek militant and two Punjabi Taliban.
Pakistan has been maintaining that the drone attacks help militants to gain more fighters by playing on anti-US sentiments.