The militant movement immediately claimed responsibility for the attack saying its target was a minibus carrying staff from the National Directorate of Security (NDS), Afghanistan’s main intelligence agency.
A giant set of security gates brought in from China to protect Kabul from large bombs and drug smuggling has not been installed for five months.
Afghan authorities are appealing to local elders in the eastern province of Nuristan to help prevent militants loyal to ISIS from expanding into new territory.
The release of the documents by Rahmatullah Nabil comes amid worsening tensions between the neighbouring countries in recent weeks.
Leaders like Vice President Abdul Rashid Dostum, who is openly critical of the government, are emerging as alternative centres of authority in northern Afghanistan.
Two Taliban suicide bombers killed at least 27 people and wounded around 40 in an attack on Thursday on buses carrying recently graduated cadets on the western outskirts of Kabul.
The Sikhs say local Muslim hardliners have stirred up hostility against them, and the community now requires police protection for their funeral rituals. Increasing numbers of Sikhs and Hindus have moved to India, their spiritual homeland, but some say they remain foreigners wherever they go.