Raigarh: In view of the security requirement for the Diwali festival, the police launched a checking campaign to prevent untoward incidents during the festival season. In connection with this campaign the police have brought in the Dog squad with the heavy police force in places where there is a great deal of availability of people at the railway station, bus stand, mall, market area, etc., investigation of suspects is being conducted and bomb disposal squads are also deployed to attend to such requirements.