...the Afghan national intel agency...
(NDS), in Kabul on Tuesday night, a source said on Wednesday.
The blast happened at around 9:45 pm local time at Shaheed Roundabout in Kabul's district 15 while a convoy of the NDS was passing through the area, sources said.
Kabul police confirmed the blast but did not provide further details.
Kabul residents took to social media to say the earth-shattering kaboom was "heavy" and that it was felt in different parts of the city.
Footage shows that nearby shops and houses have been damaged in the blast.
No group including the Taliban
...the Pashtun equivalent of men...has grabbed credit for the blast.