The Taliban warned the Afghan government on Thursday against harming any of their prisoners after reports that President Ashraf Ghani would order the execution of 11 militants on death row in revenge for the devastating truck bomb attack in Kabul.

Ghani's fragile and divided government has come under increasing pressure over its failure to provide security following a series of high-profile attacks that have killed hundreds of soldiers and civilians so far this year.

Wednesday's blast, at the start of the Muslim holy month of Ramadan, ripped through a traffic-clogged street, packed with people on their way to school or work during the morning rush hour, causing hundreds of casualties in an instant and sending a tower of black smoke into the sky.