Nine were killed when at least one member of the Afghan militia opened fire on his fellow militiamen.
The Taliban spokesman Zabihullah Mujahid said the attack that took place on Saturday was a coordinated insurgent assault on the checkpoint where the shooting took place, killing over two dozen militiamen, while the country's interior minister called it an insider attack.
Investigators were still looking into the attack in central Ghazni province's Karabagh district
Insider attacks have been steady throughout the 18-year conflict— among Afghan militias who operate in remote regions— with US and NATO troops most often targeted.
The Taliban now control or hold sway over half the country.
Last Saturday, US peace envoy Zalmay Khalilzad began several days of meetings with Taliban representatives in Qatar, where the insurgents maintain a political office.
Khalilzad, after briefly suspending talks with the Taliban, visited Pakistan on Friday and met Foreign Minister Shah Mehmood Qureshi in Islamabad.
He briefed Qureshi on US-Taliban discussions in Doha, Qatar. And In turn, Qureshi reaffirmed Pakistan's resolve to continue to play its “facilitating" role in the Afghan peace process while emphasising that the conflict in the neighbouring country had no military solution.
Khalilzad also met with Pakistani military chief General Qamar Javed Bajwa in the neighbouring city of Rawalpindi.
