The warning for Mullah Mansour to respond has been given by a council of religious clerics formed to resolve the rift among the Taliban leaders, The Express Tribune reported.
The clerics had started their mediation efforts after some Taliban leaders, including Mullah Omar's family, objected to Mullah Mansour's election and refused to swear allegiance to him.
Mullah Mansour was unwilling to meet the clerics. However, he agreed to receive them but refused to empower them to make any decision on his election, the report said.
"After a long wait, the clerics have decided that Akhtar Mansour and his colleagues should respond to the Ulema within two or three days. The Ulema will make their decision if they do not come up with their response. They will do whatever they want," Rabbani said.
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The remarks coincided with clashes between supporters of Mullah Mansour and fighters loyal to a senior Taliban commander, Mansoor Dadullah, in southern Zabul province.
Dadullah has rejected Mullah Mansour's nomination and threw his weight behind Mullah Omar's family.
Dadullah said last week that he wanted the clerics to quickly announce their decision as tensions are fast growing in parts of Afghanistan among the Taliban.
"The results of the infighting will be so disastrous that no one will even have its compensation," Maulvi Rabbani said.
The Taliban also published a biography yesterday of Mansour in a clear attempt by his backers to shore up support for him.