Round the clock checks are being carried out in mansions, lodges, commercial complexes, vehicle parking areas and airport, a police statement said.
Additional police personnel have been posted at the entry points to the city and patrolling intensified to check two and four wheelers, it said.
"Public has been advised to inform police if they see any suspected four wheeler or two wheeler which has been abandoned and any abandoned articles to the nearest police station or Police Control Room 100," it said.
Crowded areas are also being closely watched with CCTV cameras and hundreds of police posted in railway stations and bus terminuses to frisk luggage of passengers.