Khalil Haqqani, Afghanistan’s Minister of Refugees and Repatriates Affairs and a senior Taliban leader, was killed in a suicide bombing at his ministry office in Kabul.

The attack, which took place as Haqqani was leaving his office, also claimed the lives of six others, according to sources in the Interior Ministry.

The Islamic State group (IS) has claimed responsibility for the bombing. An IS statement via its “Amaq” news agency reported that the attacker waited outside the minister’s office before detonating explosives as Haqqani exited.

Khalil Haqqani was a prominent figure in the Haqqani network, a powerful faction within the Taliban. He was designated a global terrorist by the United States, which had previously offered a $5 million reward for information leading to his arrest.