India is celebrating its 68th Republic Day today, marking the anniversary of the day the country's Constitution was adopted in 1950, with the customary grand parade in the national capital and several other events. India's military strength and culture will be on display on colourful floats as a part of the annual parade at Rajpath in the heart of Delhi today. A tight security cover has been enforced in the capital and other parts of the country amid threats of terror attacks by groups like the Lashkar-e-Taiba.