An Afghan official says the death toll in a mortar attack the previous day in Afghanistan's capital city, Kabul, rose to 11, while the number of wounded has risen to almost 100.

Interior ministry spokesman Nasrat Rahimi said Friday Afghanistan's security forces were among the wounded in the attack on a ceremony attended by the country's chief executive and the former president, both of whom were unharmed.

The Islamic State group claimed the attack on a ceremony honoring a slain leader of Afghanistan's ethnic Hazaras. Most Hazaras are Shiite Muslims, reviled by the radical Sunni IS group.

Rahimi says two attackers were killed and a third was arrested. He added that those killed in the attack were all civilians.