Replying to a calling attention motion last evening, the chief minister said such situation had occurred due to non-clearance of jungles and it was not possible to guard every border pillar.
The border pillar numbers were 66,76,78,89,90,91,92,93 94, he said adding that efforts were on to demarcate the border areas by conducting surveys by representatives of the two countries.
Singh said there was a proposal to construct a 10-km long fencing where the nine pillars were found missing but it would be erected after the settlement of the border problem.
Moving the motion, senior Congress MLA R K Anand said the proposal from Myanmar to stop construction of the ICP was a serious matter.