The explosion on the evening of August 1 struck the Jawadia Mosque in the Dehr Abad area of Herat city.
No further details have been provided by the outlet so far.
The toll was likely to rise as many among the injured remained in critical condition.
Hospital authorities in Herat said all the dead and wounded were worshipping in the mosque when a suicide bomber blew himself up.
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Shiite Muslims have remained a constant target of militant attacks across various parts of the country over the past few months. The Taliban specifically denied that it was involved.
The attack there comes one day after a battle at the Iraqi embassy in the capital, Kabul, which also saw gunmen launch an assault following a suicide explosion.
Herat's governor Mohammad Asif Rahimi condemned the attack and said that the people of Herat would stand united against the enemy.
In November 2016, a bomber blown himself up inside a Shiite mosque in Kabul, killing at least 27 people and wounding dozens of others.
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But while the language on Iran's nuclear program is precise and extensive, the language involving missiles is ambiguous. According to the United States Institute of Peace , the two programs do run on similar technology.
A security source, who declined to be named, said IS could prove to be more unsafe than the Taliban in Afghanistan.
There was no claim of responsibility.
Afghanistan's national unity government said it strongly condemned the Herat attack, describing it in a statement as an "anti-Islam act".
President Ashraf Ghani added that "terrorists can not create sectarian divisions among our people".
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He was particularly harsh on Sri Lanka's spin attack, helping India maintain a run rate of 5.9 an over in the afternoon session. But India and Zimbabwe are different teams, and we are playing worldwide cricket so that confidence should help the boys.