A suicide bombing killed 13 people in a local representative's house in Jalalabad in eastern Afghanistan Sunday, a provincial official said.
Fourteen others were wounded in the attack, said Attaullah Khugyani, a spokesman for the governor of Nangarhar province.
He said the suicide bomber targeted a gathering of the family of provincial council member Obaidullah Shinwari in the province's capital city.
Among the wounded was Shinwari's father, Malik Osman, who is a prominent tribal elder and a fierce critic of the Islamic State militant group, Khugyani said.
The attack comes just days after a deadly attack on the Pakistani consulate in the same city, claimed by Islamic State.
Taliban spokesman Zabihullah Mujahid denied that his group was responsible for the latest bombing in a Twitter message.