PESHAWAR, Pakistan (REUTERS) - Haibatullah Akhundzada, the Islamic legal scholar appointed leader of the Afghan Taleban on Wednesday, was not the obvious choice when senior members of the militant movement gathered to appoint a new "emir".

The "shura", or leadership council, was convened in haste after leader Mullah Akhtar Mansour was killed by a US drone strike in Pakistan on Saturday, presenting the Taleban with their second succession in less than a year.

Some Taleban decision makers chose to call into the shura by mobile phone or Internet-based voice apps, according to one attendee, possibly wary of attending a large gathering after Mansour's killing.

Unlike a similar meeting held last July, when an important faction walked out in protest, delegates agreed on the choice of Akhundzada, said Taleban spokesman Zabihullah Mujahid.

But there was hesitation, as senior Taleban figures chose Akhundzada only after two other candidates were ruled out, said two members of the council who attended the meeting.

"Sirajuddin Haqqani was the first choice of the majority of the shura," said one of the members.

Reuters could not independently confirm his, or other accounts of what happened at the meeting.

"But (they) feared it could increase their hardships if Haqqani is made emir as he is the most wanted Taleban figure in the United States."

Haqqani, who heads a feared network behind a series of deadly bombings in the Afghan capital Kabul in recent years, has a US$10 million (S$13.8 million) bounty on his head.

Eventually Haqqani, who was not present but had representatives at the gathering, withdrew his candidacy.

Some analysts predict that, should Haqqani accept the new leadership structure, he could continue his military leadership role.

SON BUT NOT HEIR

After Haqqani was sidelined, Mullah Mohammad Yaqoob, a son of late Taleban founder Mullah Mohammad Omar who attended the meeting, was put forward as leader, but turned the offer down because he feared he lacked battle experience and was too young, said a Taleban commander at the "shura".

Yaqoob, believed to be in his mid-20s, stormed out of the council last year when Mansour was appointed Omar's successor, deepening divisions that plague the movement to this day.

This time Yaqoob proposed Akhundzada, who was chosen after the opinions of senior clerics from the Afghan provinces of Zabul, Kandahar and Helmand were consulted, said the commander.

"He (Akhundzada) initially made some excuses but had to keep quiet after the majority of the shura members insisted," he added. Both Yaqoob and Haqqani were named as deputies to the new leader.

What Akhundzada's elevation means for the insurgency in Afghanistan is not immediately clear.

He has been identified by the United Nations as the former chief of the hardline justice system imposed by the Taliban when it ruled Afghanistan between 1996 and 2001.

Within an hour of the appointment being announced, a bus carrying court employees west of Kabul was blown up in a suicide attack, killing up to 11 people and wounding more.

The Taleban claimed responsibility.

Experts said the leadership announcement came sooner than most had expected, and made sense from a point of view of stability.

"He (Akhundzada) is of the older generation, he is one of the founders. So he has more respect as a religious scholar, while Sirajuddin Haqqani and Yaqoob... are pretty young," said Thomas Ruttig of the Afghanistan Analysts Network.