A total of 56 people have been killed in the violence which erupted on Sunday between supporters of commander Khan Said Sajna and followers of the late Hakimullah Mehsud group in troubled North Waziristan.
Both factions are part of the Tehreek-e-Taliban Pakistan (TTP) umbrella group, which has been waging a bloody seven-year insurgency against the state.
Ten insurgents were killed in clashes that began when members of the Sajna group came under rocket attack in their car in the town of Shawal, a local intelligence official told AFP.
Militant sources confirmed the clash and casualties. The feud began after Sajna, a senior commander, was rejected for the TTP leadership following the killing of then-leader Mehsud last November, militants say.
The TTP has long been riven by infighting. Sajna had been seen as a strong candidate to become TTP chief following Mehsud’s death.
But the movement’s ruling council at the last minute elected Mullah Fazlullah, who hails from Swat and is believed to be hiding in Afghanistan.
Separately, Sher Amanullah, a commander of the Haqqani militant network, was killed along with two others when a roadside bomb hit their vehicle near the town of Datta Khel, intelligence and militant sources said.
Amanullah is said to be a close associate of Mullah Sangeen Zadran, who was blacklisted as a terrorist by the United Nations and United States and was killed in a US drone strike in North Waziristan in September last year.
The Pakistani government began negotiations through intermediaries with the TTP in February to try to end its insurgency.
The militant group has demanded the release of what they call “non-combatant” prisoners and the establishment of a “peace zone” from which security forces would be barred.
A bomb attack at a market in Islamabad on Wednesday killed 24 people, though the TTP denied responsibility.