"A large number of worshippers were affected by the forces of the explosion which occurred at midday," Mohammad Kabir told Xinhua.

"The worshippers in Khalifa Sahib Mosque in Sera-e-Allawoddin area of Karta-e-Sah locality in western Kabul were the apparent target of the blast. The nature of the blast has not been determined. It could be a suicide bomb blast," he said.

The Taliban security forces have cordoned off the area for precautionary measures.

The attack came shortly after Friday prayers when a group of worshippers were ritualizing Zikr, a special religious practice, to celebrate the holy month of Ramadan.

No group has claimed responsibility for the explosion yet.

In recent weeks, the war-torn country was hit by a series of terror attacks reportedly staged by militants of the Islamic State (IS) group opposing the Taliban-led caretaker government.

On Thursday, nine people were killed and 13 wounded in two explosions in northern Mazar-i-Sharif city.