A roadside bomb has ripped through a vehicle in western Afghanistan, killing 17 civilians who were part of a wedding celebration.

Afghan officials say Friday's blast occurred on a road in relatively peaceful Farah province. Most of the victims were women and children.

Authorities blamed Taliban militants.

Separately, NATO said two of its service members were killed in a roadside bombing Friday in eastern Afghanistan.

Earlier this year, a United Nations report said improvised explosive devices used by insurgents are the top cause of deaths among Afghan women and children. The U.N. has demanded that insurgents immediately stop the deliberate killing of civilians.