Several United Nations staff were among those killed on Friday when a suicide bomber blew himself up outside a popular Lebanese restaurant in the Afghanistan capital of Kabul, a UN spokesman said.
"Three United Nations personnel, along with a number of those from other international organizations, are now confirmed dead," UN spokesman Farhan Haq said in a statement.
"Such targeted attacks against civilians are completely unacceptable and are in flagrant breach of international humanitarian law," Haq said. "They must stop immediately."
Up to 15 people, mostly foreigners, were killed in the attack, police said.
Islamist Taliban insurgents claimed responsibility for the attack in the upscale Wazir Akbar Khan district, which hosts many embassies and restaurants catering for expatriates.
The International Monetary Fund (IMF) also said its representative in Afghanistan was one of the dead.