PESHAWAR (Agencies) - At least six mortar shells which were fired from Afghanistan side landed on a mountain in Barmel area of South Waziristan on Sunday sparking fear among the locals. Official sources said six mortar shells landed on a mountain situated in tehsil Barmel but caused no damage. Pakistan lodged a strong protest over the issue with the Afghan government and asked them to take stern action for stopping such incidents in future. Earlier, militants from the Afghanistan side had attacked security forces check-posts inside Pakistans territory and also targeted civilians dwelling on the Pak-Afghan border, inflicting heavy losses. On the other hand, the federal government has decided to replace police with the border forces to monitor the Pak-Afghan border areas in Chitral and Upper Dir, officials said on Sunday. According to officials, the decision was taken in the light of recommendation of provincial government. The Levies force and Frontier Corps would be deployed at border areas of Upper Dir while Chitral Scots and Chitral Border Force would replace the police in border areas of Chitral. Officials said Afghan militants recently had penetrated into Pakistani areas and attacked police posts. Khyber Pakhtunkhaw government requested the federal government to deploy border forces at these areas to avoid future attacks by Afghan terrorists. Source said federal government accepted the request and ordered interior ministry to take action in this regard. Meanwhile, officials said on Sunday that the government would install mobile biometric system at Torkham border with Afghanistan by next week. According to Interior ministry officials, the equipment has been brought to Torkham border where mobile biometric system will be installed by next week in presence of interior ministry officials. This system would keep data of all people crossing the border, officials said, adding it would help to overcome the terrorism and militancy. Pakistan has already installed biometric system on Chaman border with Afghanistan and would extend it to Bajaur Agency, Miran Shah, Mohmad Agency and to other areas along the Afghan border.