Three US drone attacks on a single day have killed at least 18 people, injured several others in Pakistan's tribal district of North Waziristan, Press TV reported.
Pakistani security officials say the latest attack has killed four people, adding that 14 others had been killed in the other two US drone attacks in the same volatile tribal district.
The last drone attack targeted a building in a village five kilometers northwest of Miranshah town.
The United States claims its drone attacks target militants. However, hundreds of civilians have been killed in such imprecise attacks since 2007.