The Islamic State group on Monday claimed responsibility for a suicide bombing in eastern Afghanistan that killed at least 19 people, mostly Sikhs and Hindus.
The bomber targeted a delegation from the minority communities as it was traveling to the governor's residence in the eastern city of Jalalabad on Sunday for a meeting with President Ashraf Ghani.
Avtar Singh Khalsa, a longtime leader of the Sikh community, was among those killed. Another 20 people were wounded.
In a statement released Monday, ISIS said it had targeted a group of "polytheists."
Sikhs and Hindus face discrimination in the conservative Muslim country and have been targeted by Islamic extremists in the past, leading many to emigrate. The community numbered more than 80,000 in the 1970s, but today only around 1,000 remain.
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The UN Security Council condemned the Jalalabad attack "in the strongest terms" and underlined the need to bring the perpetrators, organizers, financiers and sponsors "of these reprehensible acts of terrorism" to justice. A council statement on Monday urged all countries to cooperate with Afghan authorities in finding those responsible.
UN Secretary-General Antonio Guterres also condemned the Jalalabad attack stressing that "any attack deliberately targeting civilians is unjustifiable and in clear violation of international law," UN deputy spokesman Farhan Haq said.
"The United Nations stands with the people and government of Afghanistan as they strive for peace and reconciliation for their country," Haq said Monday.
Earlier, the UN mission to Afghanistan condemned the attack in a statement, saying "the architects of this appalling crime must be brought to justice."
The UN also condemned an attack late Saturday in which militants killed three night watchmen outside a school and beheaded two of them before torching the building. That attack was also claimed by the Islamic State group.