Taliban claimed responsibility for attack that killed at least 8 people in Ghazni . 4 killed when car laden with explosives rams a military convoy in Helmand province . Civilian deaths in Afghanistan have surged due to improvised explosive devices , U.N. reports . CNN 's Marilia Brocchetto contributed to this report . Gunmen ambushed a convoy of military trucks , killing 6 drivers in Kabul province on Tuesday .
Taliban claimed responsibility for attack that killed at least 8 people in Ghazni . 4 killed when car laden with explosives rams a military convoy in Helmand province . Civilian deaths in Afghanistan have surged due to improvised explosive devices , U.N. reports . Gunmen ambushed a convoy of military trucks , killing 6 drivers in Kabul province on Tuesday .