MIRANSHAH (INP) Security forces have imposed indefinite curfew in North Waziristans regions of Miranshah, Mir Ali and Razmak.The major Bannu-Miranshah road will also remain closed. All roads catering to movement of NATO troops and services have also been closed. Traffic has been halted at Pak-Afghan Torkham border after a possible suicide-bombing alert. Meanwhile, official sources have revealed that an explosive device planted at bridges connecting two areas in Bara area, five kilometres away from Khyber Agency blasted with a bang, disconnecting Akakhel with rest of the country.