Afghanistan’s acting minister for refugees has been killed in an explosion in the capital, Kabul, according to his nephew and officials. Khalil Ur-Rahman Haqqani was killed on Wednesday in the blast that also claimed the lives of five others, local media said.

Suicide blast in Afghanistan’s capital marks the highest-profile casualty since the Taliban retook power three years ago.

The government accused the Islamic State of being behind the attack, which struck at the heart of the Taliban’s power structure after years of essentially unchallenged dominance.