Details of the latest USA drone attack emerged as an Afghan delegation led by the neighboring country's deputy foreign minister, Hekmat Khalil Karzai, opened a new round of wide-ranging talks Friday with Pakistani counterparts in Islamabad.
A spokesman for the militant group, who's aim is to bring down the Pakistan government said the drone strike happened in the North Waziristan region, on the Pakistani side of the border.
The officials spoke on condition of anonymity because they are not authorized to speak to the media.
"We confirm that deputy head of the TTP Khalid Mehsud died in a drone strike", said the spokesman, Mohammad Khurasani.
Pakistan opposes drone strikes, saying they violate its sovereignty.
Pakistan denies sheltering militants.
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They said the deputy chief of the outlawed Pakistani Taliban, Khan Said Mehsud, also known as Sajna, was returning from the adjacent Afghan border province of Khost when missiles fired from an unmanned aircraft hit his vehicle.
A Taliban infiltrator killed 16 members of a pro-government militia force in the insurgency ridden southern province of Helmand when he turned his gun on men who he had worked with for months, officials said on Monday.
Pakistani security officials insist that majority of the Taliban leaders and fighters have fled to neighboring Afghanistan after the military carried out major offensive in the tribal regions.
The border region is off limits to journalists and verifying information independently is hard.
Earlier, reports suggested that Sajna was among two men taken down in the USA strike.
Relations between the United States and Pakistan have been strained since January 1 when Trump's denounced Pakistani "lies and deceit" over its support for the Afghan Taliban and their allies.