KABUL, Afghanistan — A suicide bomber blew himself up today in a wedding hall in northern Afghanistan, killing at least 23 people including a prominent warlord-turned-politician and three Afghan security force officials, in an attack that deals a setback to efforts to unify the nation’s ethnic factions, Afghan officials said.

Ahmad Khan Samangani, an ethnic Uzbek and anti-Soviet guerrilla leader in the 1980s who later became a member of parliament, was welcoming guests to his daughter’s wedding when the explosion occurred in Aybak, the capital of Samangan province.

President Hamid Karzai said 23 people were killed and about 60, including government officials, were wounded in the attack, which he condemned and said was “carried out by the enemies of Afghanistan.” He ordered a team from Kabul to fly to the northern province to investigate the bombing.

No one has yet claimed responsibility for the blast.