The radio silence gave way to frantic conversations. Local Taliban commanders sought reassurance. Mullah Omar, the mujahedin commander of Kandahar, had finally been declared dead and along the porous border between Afghanistan and Pakistan, confusion reigned. Listening to the hurried conversations in Kandahar on Wednesday night were the Afghan border police.

“What are our orders now?” one Taliban soldier near the Pakistan city of Quetta said. “We don’t know,” another replied. “Is Mullah Omar dead? Who is leading us?”

A border police officer, 32, who has lost six members of his family to Taliban attacks, told The Independent that district commanders of the Afghan Taliban were unsure whose orders to follow. “They don’t know who their leaders are,” the police commander said. “The Taliban are worried and confused. They are not fighting they are just talking on the radio.”

Mullah Omar was made the 'Supreme Leader' of the Taliban movement in 1998 (EPA)

Final confirmation of the long-suspected demise of Mullah Omar, the one-eyed Taliban leader who sheltered Osama bin Laden after the World Trade Centre attacks, has threatened to splinter the Taliban into rival factions: those who will enter peace talks, and those who will not.

But The Independent has seen evidence that, at least nine months ago, senior commanders within the Taliban knew of their leader’s death and were already plotting who would succeed him. Letters allegedly intercepted by Afghan intelligence, and written nine months ago by two Taliban commanders – Mullah Mansour Dadullah and Mullah Abdul Qayum Zakir – appeared to urge Taliban members to rebel against Mullah Omar’s then deputy, Mullah Akhtar Mansour.

In Quetta, the Taliban’s seven most powerful figures met to discuss what should happen next – and from it, Mullah Mansour emerged as their new leader.

Soon after, it was announced that Friday’s second round of peace talks with the government of President Ashraf Ghani had been cancelled. “In view of the reports regarding the death of Mullah Omar and the resulting uncertainty, and at the request of the Afghan Taliban leadership, the second round of the Afghan peace talks, is being postponed,” said a statement from Pakistan’s foreign ministry.

The letters were written by two Taliban commanders, and accuse Mullah Mansour of plotting to kill Mullah Omar

The letters said to have been seized by Afghan intelligence both address members of the “Islamic Emirate of Afghanistan” and accuse Mullah Mansour of plotting to kill Mullah Omar.

The first, apparently from Mullah Dadullah, says: “I am sure that the Emir of the Faithful [Omar] was martyred on the advice of... Mansour. In every province, provincial committees should carry on their own jihad struggle until we know who is the new leader. Especially those great dearest mujahedin, under my command, that they should distance themselves from Mullah Akhtar Mansour and his group.”

It adds: “I say that soon people like Mullah Akhtar Mansour and other snakes like him will suffer such pain that, as a result, the soul of the all the good martyrs of the movement will find peace.” The letter accuses Mullah Mansour of “using the good name of the Taliban group for most impure profits”.

The second, apparently written by Mullah Zakir, accuses Mullah Mansour “and other corrupt agents like him” of breaking off from the leadership “in the hope of taking the inheritance of the movement”. It adds: “The creator of all this problem is… Mansour and his Punjabi advisers. There is no doubt that, God forbid, the martyrdom of the Emir of the Faithful [Mullah Omar] was caused by Akhtar Mohamed Mansour.” There is no evidence to support either commander’s claims.

In pictures: Aftermath of Taliban massacre in Peshawar Show all 12 1 /12 In pictures: Aftermath of Taliban massacre in Peshawar In pictures: Aftermath of Taliban massacre in Peshawar Army Public School A Pakistani soldier shows the media a burnt classroom at an army-run school a day after an attack by Taliban militants in Peshawar In pictures: Aftermath of Taliban massacre in Peshawar Army Public School A journalist reacts as he visits the Army Public School that was attacked by the Taliban militants in Peshawar In pictures: Aftermath of Taliban massacre in Peshawar Army Public School Pakistani security officials inspect the premises of Army Public School after the attack by the Taliban militants in Peshawar In pictures: Aftermath of Taliban massacre in Peshawar Army Public School Journalists inspect the premises of Army Public School In pictures: Aftermath of Taliban massacre in Peshawar Army Public School A view of a class room of Army Public School In pictures: Aftermath of Taliban massacre in Peshawar Army Public School A view of the blood stained auditorium of Army Public School that was attacked by the Taliban militants in Peshawar In pictures: Aftermath of Taliban massacre in Peshawar Army Public School Pakistani video journalists film inside the auditorium of an Army Public School a day after an attack by the Taliban, in Peshawar, Pakistan AP In pictures: Aftermath of Taliban massacre in Peshawar Army Public School Chairs are upturned and blood stains the floor at the Army Public School auditorium the day after Taliban gunmen stormed the school in Peshawar AP In pictures: Aftermath of Taliban massacre in Peshawar Army Public School A pair of glesses lays on the floor of the blood stained auditorium In pictures: Aftermath of Taliban massacre in Peshawar Army Public School Pakistan army soldiers stand outside the auditorium of an Army Public School a day after an attack on the school, in Peshawar AP In pictures: Aftermath of Taliban massacre in Peshawar Army Public School Pakistani journalists film and photograph inside an auditorium of the Army Public School attacked the day before by Taliban gunmen AP In pictures: Aftermath of Taliban massacre in Peshawar Army Public School A broken window of a class room of Army Public School

The Afghan government has said Mullah Omar died in a Karachi hospital “suspiciously”. Sources in Kabul claim that he may have contracted tuberculosis. A statement purportedly from Mullah Omar’s brother, Mullah Abdul Manan, and his son, the Taliban commander Mullah Mohammad Yaqoob, apologised for “any mistakes Mullah Omar [made] during his rule of Afghanistan”.

Sirajuddin Haqqani, who led the so-called Haqqani Network’s campaign of terror in Afghanistan, was named as Mullah Mansour’s deputy. The move was seen as an attempt to avoid infighting between Mullah Mansour and Haqqani, whose father rose as a mujahedin leader favoured by the US in the 1980s. The Haqqani Network is based in North Waziristan on the border between the two countries, and is believed to have introduced suicide bombing to Afghanistan.

The Taliban’s new leader, Mullah Mansour, is understood to favour peace talks. “They [Pakistan] want to bring in someone who can speak, negotiate and play a visible role [in the peace process], that is Mansour,” said Amrullah Saleh, the former head of Afghanistan’s National Directorate of Security.

He said: “It is all calculated. It is all an ISI [Pakistani intelligence] game. The time for the mythical figure is gone. Someone reachable and touchable has to be brought in. That is Mansour.”

Civilians defend the village of Sor Kandaw, in the Afghan province of Nangarhar, against the Taliban in 2012 (AFP)

On the Shomali Plain, a stretch of once-fertile land north of Kabul where Mullah Omar’s retreating Taliban poisoned wells, cut down trees and destroyed crops in 1997, there was little hope that Mullah Mansour’s leadership would lead to change.