KABUL, Afghanistan — The Islamic State group has claimed responsibility for a suicide bombing on a peaceful protest in the Afghan capital on Saturday that killed at least 80 people and wounded more than 200, marking the first time the extremists have struck Kabul and raising fears of their growing strength and capability in Afghanistan.

The attack was the deadliest to hit Kabul in 15 years of civil war. It struck a demonstration by Afghanistan's Hazara ethnic community, who were...

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