CHAMAN (APP) - NATO forces in Afghanistan have installed a sophisticated surveillance system along the Pak-Afghan border to monitor the movement of insurgents in the area. Equipped with more than half a dozen security cameras, the sprawling three hundred yards tall balloon type satellite tower has been installed at Spin Boldak town and can easily be seen from Chaman town, which lies about a kilometre south of Spin Boldak. An Afghan security official told this news agency on the conditions of anonymity that the tower would be instrumental to monitor the border especially during the Nato operation against the Taliban in Kandahar. He added that if needed more such towers would be installed inside the Afghan territory adjoining Pakistan.