Powerful bomb explosion kills over 20 Shia Muslims in western Afghanistan

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.

Mehdi Hadid, a lawmaker from Herat, who went to the site soon after the explosion told The Associated Press that the scene was one of horrific carnage.

"Based on our initial information two terrorists were involved one of them wearing a suicide vest, who detonated himself while the second one was armed with a rifle".

On June 15, a terrorist attack on a Shia community mosque in capital Kabul involving at least two suicide bombers killed at least six people.

A spokesman for the interior ministry had earlier said he suspected the explosion may have been caused by a auto bomb.

He said around 30 people had been injured and casualty numbers were likely to rise.

In recent months, Daesh has been making inroads in Afghanistan through alliances with local militant outfits.

No group has claimed responsibility for the attack so far.

Herat, close to the border with Iran, is considered one of Afghanistan's more peaceful cities.

He said at least 25 others who sustained injuries in the attack were also shifted to the hospital for the treatment.

Areas dominated by Shia Muslims in Afghanistan have been hit by attacks repeatedly in the past year, by both IS and the Taliban.