"An explosion happened in front of police precinct 13 in west Kabul," Estanakzai told AFP.

"We also have reports of small arms fire. A couple of other explosions have also been reported in Shar-e-Naw area of Kabul. We will provide more details later." There was no immediate claim of responsibility for the attacks that come just over a week after twin blasts in Kabul killed 25 people, including AFP chief photographer Shah Marai and eight other journalists.

That attack was claimed by the Islamic State group.

The Taliban recently launched their annual spring offensive, in an apparent rejection of a peace talks overture by the Afghan government.