The video, apparently shot in the eastern Afghan province of Nangarhar in June, gave a glimpse into the struggle the Taliban is waging against Islamic State – both considered ultra-hardline groups – for supremacy of the Islamist insurgency in Afghanistan, the report says.
"A horrific video was released yesterday showing kidnappers who associate themselves with Daesh (Islamic State) brutally martyring several white-bearded tribal elders and villagers with explosives," said a statement posted on the Taliban's website.
The Taliban, which itself if frequently accused of brutality against Afghan government soldiers that it captures, said prisoners should never be treated in such a manner.
"This offence and other such brutal actions by a few irresponsible ignorant individuals under the guise of Islam and Muslims are intolerable," it said.
