"The explosion happened when the worshippers were inside the mosque," the Khaama Press quoted Ghor governor's spokesman Abdul Hai Khatibi as saying.
However, eyewitnesses are saying that more than 30 people have died.
They further said that a commander of the public uprising forces in Ghor Fazl-ul-Ahad Khan is among those who lost their lives in the explosion.
No group has claimed the responsibility so far.
Ghor was among the relatively calm provinces in north-western parts of the country but the province has started to witness growing instability during the recent years as both the Taliban insurgents and ISIS loyalists attempt to expand their foothold in this province. (ANI)