Ground-to-air security has been mounted in the national capital with over 25,000 police and para-military personnel keeping a constant vigil, a day before unfurling of the 65th Republic Day celebrations at the majestic Rajpath here.
Sharpshooters of the National Security Guard (NSG) will position themselves on rooftops of high-risers along the 8-km route of the parade which will showcase India's military might and rich cultural diversity.
Patrolling at marketplaces and other vulnerable areas has been intensified and checking and frisking at Metro, railway stations and bus terminals stepped up, officials said here.
A central monitoring centre has also been established where CCTV footage from around 160 CCTV cameras installed on the parade route will be relayed live.
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In Punjab, Haryana and Union Territory of Chandigarh, vigil has been heightened at bus stands, railway stations, government building, dams and other places.
In Rajasthan, all guest houses and hotels have been asked to strictly check the identity of guests.
Amid boycott call of the celebrations by insurgents in restive Manipur, security has been heightened in the northeast state, officials said in Imphal.
Police are intensively frisking the passers-by to detect movement of militants who have reportedly infiltrated in the state capital complex to disrupt the event, they said.