Guwahati, Jan 24 (ANI): Assam tightened security across all its districts ahead of 66th Republic Day. In a sign of growing warmth between the two nations, US President Barack Obama will be the chief guest at this year's Republic Day glitzy parade which showcases country's military might and rich heritage. The preparation for Republic Day, which is celebrated on January 26, is in full swing. Participants including men in uniform and school students carried out rehearsals in dusty ground, while the state is under security blanket and CCTV cameras have been installed in and around the parade ground. Security personnel are carrying out regular checks at railway platforms, tracks and also conducting frisking of vehicles and commuters on road in Guwahati city. As the northeast is home to several separatist revolts, thousands of troops are deployed to prevent any untoward incident. Director General of Police (DGP), Khagen Sharma said there are intelligence inputs that militants are desperate to create mayhem on the eve of Republic Day.