Sources at the scene told Al Jazeera that 15 people had been killed in the mosque blast.
An explosion outside a mosque in the city of Herat in western Afghanistan killed a high-profile pro-Taliban cleric as well as more than a dozen civilians.
“Mujib Rahman Ansari, with some of his guards and civilians, have been killed on their way toward the mosque,” said Herat’s police spokesperson Mahmood Rasoli.
Rasoli did not say how many casualties the blast caused on Friday.
Sources at the scene told Al Jazeera that 15 people had been killed. There was no immediate claim of responsibility for Friday’s explosion.
Mujib Rahman Ansari had spoken strongly in defence of the Taliban at a large gathering of thousands of scholars and elders organised by the group in late June, condemning anyone who stood against their administration.
The Taliban say they have improved security in the country since taking power around a year ago, but there have been several blasts in recent months, some of them targeting busy mosques during prayers.
The United Nations has raised concerns about the growing number of attacks and some blasts have been claimed by a local branch of the Islamic State.