The Taliban on Friday announced their annual spring offensive, which comes as the US and Afghan politicians try to negotiate for a peace settlement with the militants.
Abdul Samad Salehi, a provincial councilman, says the convoy was heading to defuse a roadside bomb on Wednesday afternoon when the ambush happened in Anardara district.
The somber statistic reflects what many say is a growing problem in Afghanistan's brutal war, in which civilians die not only in massive suicide bombings and insurgent attacks but also in the cross-fire as Afghan and Nato forces pursue militants.
An Afghan official says the Taliban have targeted security checkpoints in northeastern Takhar province, killing eight members of the security forces.
Nasrat Rahimi, a spokesman for the interior ministry, says that Mena Mangal, a cultural adviser for the lower house of the parliament and former TV presenter, was killed when she was on her way to work on Saturday morning.
Torrential rainstorms have lashed drought-stricken Afghanistan in recent days, bringing widespread flooding that has killed at least five people and washed away homes including in the capital Kabul, officials said Tuesday.
The brazen attack last weekend sparked global outrage over the plight of Afghan women, who still suffer rampant levels of physical and mental abuse, sexual violence and discrimination.
The attack outside the Marshal Fahim National Defense University in western Kabul took place at the road entrance to the war college.
Afghan civilians are for the first time being killed in greater numbers by US and pro-government forces than by the Taliban and other insurgent groups, a UN report released on Wednesday revealed.