ISIL claimed responsibility for a suicide bomb attack near a Shiite mosque in the western Afghan city of Herat on Sunday, but provided no evidence for its claim.
The group made the claim via a statement released online by its Amaq news agency.
Two suicide bombers blew themselves up, killing at least one person and wounding seven others, police said.
Deputy police chief Aminullah Amin said the bombers had tried to enter the mosque but blew themselves up when challenged by guards at the site.
The attack comes just days after an ISIL suicide bomber killed 26 people in the capital Kabul and injured dozens more on the road to a Shiite shrine, as Afghans celebrated the Persian new year on Wednesday.
Both the Taliban and ISIL have increasingly targeted the war-weary city in recent months as US and Afghan forces ramp up air strikes and ground offensives against the groups.
More to follow