The United States and China have been pushing for the process to restart, but frosty ties between Islamabad and Kabul have been hampering those efforts.
Afghan Taliban leader Mullah Akhtar Mansour was seriously injured in a firefight following a heated argument at a meeting of militant commanders, officials said on Wednesday, exposing deepening divisions within the fractious militant movement.
It was unclear if he survived the clash, which occurred just four months after Mansour was appointed Taliban supremo in a deeply acrimonious leadership succession.
Five other Taliban members were killed in the gunfight triggered by a bitter verbal duel at the meeting near the Pakistani town of Quetta, said Sultan Faizi, the spokesman for the Afghan first vice president.
"Mansour was seriously injured. He was rushed to hospital and we are not sure if he survived his wounds," Faizi told AFP, citing "credible information".
Taliban spokesman Zabihullah Mujahid denied that any such firefight took place but an Afghan intelligence source confirmed Faizi's account, and insurgent sources also told AFP that Mansour had been injured.
The development comes amid a renewed push in Afghanistan and Pakistan to jumpstart peace talks with the Taliban, which stalled after the militants belatedly confirmed longtime leader Mullah Omar's death.
A Taliban source close to Mansour's group told AFP that a number of insurgent members were injured and killed in the firefight.
"Akhtar Mansour is among the injured but the extent of his injuries is not clear," he said, a claim that was corroborated by another insurgent source.
There was conflicting information on the location of the confrontation, with some sources claiming that it took place near Kandahar, the main city of southern Afghanistan and the birthplace of the Taliban.
But they all agreed the meeting was at the home of Abdullah Sarhadi, a commander in Mansour's group.
Sarhadi was a former Guantanamo Bay prisoner, according to Taliban sources and a Western official.
"There were differences on some points which later turned into harsh words, then Sarhadi opened fire and the others returned fire," the Taliban source said.
Deep RiftsMansour was appointed Taliban leader on July 31 soon after the insurgents confirmed the death of Omar, who led the Islamist movement for some two decades.
But splits immediately emerged in the movement following his appointment, with some top leaders refusing to pledge allegiance to him, saying the process to select him was rushed and even biased.
Many were also unhappy that Omar's death had been kept secret for two years -- during which time annual Eid statements were issued in his name.
A breakaway faction of the Taliban led by Mullah Mohamed Rasool was formed last month, in the first formal split in the movement.
But despite the divisions, there has been no let up in insurgent attacks -- and the Taliban has seen a new resurgence under Mansour.
They briefly captured the strategic northern city of Kunduz in September in their most spectacular victory in 14 years of war.
Pakistan, which wields considerable influence over the militants, hosted a historic first round of peace negotiations in July.
But the talks stalled soon after Omar's death was confirmed.
The United States and China have been pushing for the process to restart, but frosty ties between Islamabad and Kabul have been hampering those efforts.
Mansour and his two newly named deputies are seen as close to the Pakistani military establishment, which has historically nurtured and supported the Taliban.