KABUL, Afghanistan (AP) — Gunmen opened fire Friday at a ceremony in Afghanistan's capital attended by prominent political leaders, killing at least 29 people and wounding dozens more before the two attackers were slain by police, officials said.

The Taliban denied they were behind the attack, which came less than a week after the U.S. and the group signed an ambitious peace deal that lays out a path for the withdrawal of American forces from the country.

While no one has claimed responsibility for the bloodshed, Afghanistan's upstart Islamic State affiliate has declared war on the country's m...