Separate roadside bombings have killed 12 Afghan civilians and a Polish soldier in eastern Afghanistan.
The Polish defense ministry says a soldier was killed and five other service members were wounded Friday in Ghazni province.
Elsewhere in Ghazni, NATO says three Afghan construction workers were killed and two others wounded Thursday, when a bomb exploded in the Qarabaugh district.
Later in the day, nine construction workers were killed in a separate roadside bombing in the Bar Kunar district of Kunar province.
Separately, South Korea's foreign ministry said Friday that Afghan security personnel staged a rocket attack in June on the construction site of South Korea's civilian base in northern Parwan province.
The attack caused no casualties. The ministry says it is not clear why Afghan security guards fired rocket-propelled grenades at the site. The South Korean Yonhap news agency says four guards have been taken into custody.
Some information for this report was provided by AP and AFP.