“An Afghan branch of the Islamic State group on Monday claimed responsibility for a suicide bombing in Pakistan that killed at least 54 people at a pro-Taliban party’s election rally, in one of the region’s worst attacks in recent years.

Islamic State in Khorasan Province made the claim in a statement posted on its Amaq website. It said the attacker detonated an explosive vest, and that the bombing Sunday in the northwestern town of Bajur was part of the group’s continuing war against forms of democracy it deems to be against Islam.”