At least seven people were killed and 25 others wounded on Sunday afternoon in Kabul city when a suicide bomber targeted Ahmad Shah Massoud supporters, officials confirmed.
Kabul police chief spokesman Hashmat Stanekzai said the suicide bomber was riding in a motorcycle when he detonated his explosives among the supporters.
The attack happened in Taimani in Kabul city while a convoy of Massoud supporters in cars and on motorcycles were driving through the area.
The explosion happened after National Directorate of Security (NDS) officers gunned down another suicide bomber near the United States embassy in Kabul before he could detonate his explosives among a group of Massoud supporters.
September 9 is the death anniversary of Ahmad Shah Massoud, the national hero of Afghanistan, who was assassinated by two insurgents posing as journalists in Takhar province in 2001.
To mark the day, hundreds of Massoud supporters took to the roads in convoys of vehicles, firing indiscriminately into the air.
The random gunfire rang out throughout the day in the capital. Shops were closed and streets were largely deserted as Kabul residents took shelter in their homes.
Kabul police meanwhile said they had by mid-afternoon arrested over 100 people for shooting into the air and seized 10 weapons and 25 vehicles.