Governors unfurled the tricolour in their respective states and outlined its achievements while also urging the citizens of the Republic to take pledge to meet the challenges ahead.
In Kashmir, all Republic Day programmes, including the main event in Srinagar, were uneventful amid heightened security measures in view of intelligence reports suggesting that militants might target the functions.
"The Republic Day functions at all district headquarters passed off peacefully," a senior police officer said.
In Uttar Pradesh, energy and patriotism marked the celebrations with the main function being held at the state capital Lucknow. At Vidhan Bhawan, Governor Ram Naik took the salute of the parades put up by the army, central forces and school children.
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The Governor on the occasion asked people to re-dedicate themselves to the service of the nation.
V P Singh Badnore, Punjab Governor and the administrator of UT Chandigarh, unfurled the national flag in Pathankot, while Haryana Governor Kaptan Singh Solanki hoisted the tricolour in Ambala.
Jaisalmer Superintendent of Police Gaurav Yadav said they will be interrogated by a joint team of military intelligence and Jaisalmer police. Possession of satellite phone without authorisation is not allowed in the country.
Bihar Governor Satya Pal Malik hoisted the tricolour at the famous Gandhi Maidan at Patna on the occasion and said the state was working for the development of all sections of the society.
The government will take measures to empower the youth and the marginalized sections of the society, he said, after taking a salute at the marchpast by contingents of Bihar police and central armed forces.
Later in the day, the CM hoisted the flag at his official residence and at a "Mahadalit Tola" in Punpun block of rural Patna.
The tricolour was also unfurled at the offices of political parties like the BJP, the Congress, the RJD and the JD(U) besides government establishments and educational institutions.
In neighbouring Jharkhand, after unfurling the tricolour Governor Droupadi Murmu said the state is second only to Gujarat in terms of growth rate in the country.
West Bengal Governor K N Tripathi hoisted the tricolor at Red Road in Kolkata. He also presided over an hour-long march past of the armed forces, police forces and civilians, including school students.
Hoisting the tricolour on the occasion, Mukhi said, "The state government has embarked upon a project under the nomenclature 'Assam: Flood, Erosion and River Management Modernisation Project' at a tentative cost of Rs 1,500 crore."
Maharashtra Governor Ch Vidyasagar Rao addressed a gathering at Shivaji Park in Mumbai after reviewing an impressive parade to mark the day.
Tableaux on P-21 surface-to-surface missile, surface-to- air missile, Rakshak Bulletproof vehicle, Mahila Suraksha Pathak vehicle, Jalyukta Shivar scheme, were a part of the parade.
While, Goa Governor Mridula Sinha said although tourism was generating revenue in the state, it has also brought with it issues like narcotics and human trafficking.
"The government is committed to fight these evils. I am hopeful that joint efforts by the people and the government will weed out these evils from the state," she said at the Republic Day function in the state capital of Panaji.
In his speech, Mizoram Governor Lt Gen (Retd) Nirbhay Sharma congratulated the people of the state, NGOs, religious institutions and media for being committed to protect peace and harmony.
While in his speech, Arunachal Pradesh Governor Brig (Retd) Dr B D Mishra exhorted the people to contribute to the remarkable growth plan being carried out by the state government to put the state in the highest-growth trajectory.
The day was celebrated across Odisha amid tight security as Governor S C Jamir unfurled the tricolour on the Mahatma Gandhi Road in the state capital.
In Karnataka, Governor Vajubhai Vala urged the people to build a strong nation on patriotic sentiments and scientific temperament as he addressed the gathering after unfurling the tricolour at the historic Manekshaw Parade ground.
Meanwhile, Kerala Governor P Sathasivam expressed concern over some youths falling prey to political and communal feuds and also joining terror outfits.