The transition presents an enormous test for the Islamists in a desperately poor, diplomatically isolated country where deep-seated political and social problems have been compounded by more than four decades of war.
A devastating suicide bomb attack claimed by IS outside Kabul airport on Thursday killed scores of people who were hoping to flee the country, as well as 13 US service members.
Kabulov added that without doing so the new Afghan authorities will turn to "the trafficking of illegal opiates" and "sell on the black market the weapons" abandoned by the Afghan army and the United States.
The TTP claimed responsibility for the attack in a Telegram message shared with a Reuters journalist and denied having suffered any losses in the retaliatory fire.
Little is still known about Akhundzada's day-to-day role, with his public profile largely limited to the release of annual messages during Islamic holidays.
