"There has been an explosion at the gate of Jawadya mosque in Herat city, possible caused by a auto bomb".
The incident took place around 8:30 pm local time near Jawadia mosque in the city but the type of the explosion has not been ascertained so far.
"The death toll has risen to 29 killed and 63 wounded".
Taliban spokesman Qari Yosuf Ahmadi said in a statement his group had nothing to do with the attack.
It is not yet clear whether there was a second attacker but witnesses in the area reported hearing another explosion about 10 minutes after the initial bomber detonated his explosives.
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ISIS has been expanding its footprint in eastern Afghanistan and has recently claimed responsibility for several devastating attacks in Kabul.
A security source, who declined to be named, said IS could prove to be more risky than the Taliban in Afghanistan.
Dozens of local residents, who are mostly Shiites, attacked the police station pelting it with stones and setting it on fire, said Farhad.
The attackers, who are both dead, targeted the mosque while around 300 people were inside.
November past year saw a massive suicide blast kill at least 27 people and wound 64 at a Shiite mosque, again in the Afghan capital.
President Ashraf Ghani also condemned the attack and said insurgents would not succeed in fueling sectarian wars in the country by conducting such attacks.