ISLAMABAD (Online) Security Forces have arrested a US national entrusted with the mission to kill Osama Bin Laden while illegally crossing over Pak-Afghan border to enter Afghanistan. According to a private TV channel report on Monday, US national had entered Chitral on June 2 and wanted to enter Afghanistan by deceiving security personnel but he was taken into custody. The preliminary investigation revealed that the US national had earlier visited Pakistan seven times and he was assigned the mission to trace and kill Osama bin Laden. He has been shifted to unknown place for interrogation.