It was not clear who was behind the explosion. Several blasts claimed by Islamic State hit the northern cities of Kunduz and Mazar-i-Sharif the previous day. One of them, at a mosque and another day earlier at a school in western Kabul, targeted the Shi'ite minority.

Afghanistan's Taliban rulers say they have secured the country since taking power in August, but international officials and analysts say the risk of resurgence in militancy remains.