Four Pakistani civilians, including two children, were killed when the Afghan National Army fired mortar shells from across the border in Niz Narai area of South Waziristan on Sunday.
According to a private TV channel, the Pakistan government strongly condemned the cross-border shelling by the Afghan National Army.
Military sources said the Afghan National Army fired mortar shells from the KK Top checkpost in Afghanistan, which hit a vehicle carrying passengers who were returning home after collecting firewood near the Pak-Afghan border. All passengers died on the spot.
Condemning the unprovoked attack, the government said such incidents were unacceptable.
There have been frequent incidents of cross boarder violations by the Afghan forces in 2012 despite protests by the Pakistan government.
Earlier on November 8, a woman was killed and a man injured when mortar shells fired from across the border in Afghanistan landed on houses in the Datta Khel tehsil of North Waziristan Agency. Many Pakistani civilians and security personnel have been killed in these cross border violations.