Lakki Marwat

Polio team 'left the area after covering missed children'; officials claim attack not linked to vaccination drive

Two-year-old had tested positive for the virus but shows none of the symptoms

Explosion occurred while children tried to clean hand-grenade

Sometimes workers fill out data forms without actually inoculating children, says an official

Initiative will help resolve problems faced by locals

Five tribesmen, believed to be IDPs were on board in a vehicle when the explosion occurred, police say