A huge blast has hit a busy road in Afghanistan’s capital Kabul during rush hour, leaving at least four people injured.

The explosion took place on the road close to a university and an old parliament building in the city just before 17:00 local time (1230 GMT).

Sediq Seqqi, a spokesman for the Afghan Interior Ministry, said the target of the blast appeared to have been a bus transporting employees of Afghanistan’s Ministry of Mining and Petroleum.

Officials said three men and one woman were injured in the blast.

The explosion was set off by a terrorist who detonated his explosives on Darul Aman road, witnesses said.

Photos from the scene of the blast showed a small bus with its windows shattered.

The news comes as fierce fighting is underway in the northern city of Kunduz between government forces and Taliban militants.

On October 3, Taliban militants pushed for the city center following fierce clashes with government forces, which broke out earlier in the day. The attack was later repelled by Afghan troops. The militants briefly seized the city last year.

Taliban lost its grip over Afghanistan in 2001 after the US-led invasion, and has since retreated to rural areas, resorting to hit-and-run attacks on cities.