The blast reportedly occurred inside Guzargah Mosque.

“Mujib Rahman Ansari, with some of his guards and civilians, have been killed on their way toward the mosque,” Herat’s police spokesperson Mahmood Rasoli told Al Jazeera.

Rasoli did not say how many casualties the blast caused.

Sources at the scene told Al Jazeera that 15 people had been killed.

The blast happened during the Friday prayers inside the mosque and was due to a suicide attack, local officials told Tolo News.

There are no details about the number of casualties but local people told the news portal that many people were killed and wounded in the blast.

No group has claimed responsibility for the incident so far.