Increase in polio virus among the children of FATA added to the worries of the health authorities as two new polio cases surfaced in Khyber Agency on Wednesday. According to officials of IPI FATA, two children, Farmanullah, 06, and Naila hailing from Qaziabad and Tapu Mazakhel areas of tehsil Bara of Khyber Agency were found affected with polio virus. The FATA officials said that polio vaccination teams could not reach the far flung areas of the tribal agencies due to security risks which resulted in surge of polio cases among the local children.