Red, the symbolic colour of love, was the theme at many restaurants and food joints, and youngsters thronged parks and gardens to celebrate the moments with their special ones.
In Delhi, rains and overcast skies provided a perfect backdrop for the young and old to display their affection for their loved ones.
Braving rainy and chilly weather, over 5000 people, mostly young couples visited the Garden of Five Senses here at a floral festival that was inaugurated today, coinciding with the day marked for love in the calendar.
And, while the national capital saw the day passing off peacefully, celebrations in other parts of the country were marred by disruptive activities from radical groups.
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In Ahmedabad, Bajrang Dal and Vishwa Hindu Parishad (VHP) activists threw rotten tomatoes at couples celebrating the occasion on the banks of Sabarmati river there, calling Valentine's Day as an "obscene celebration".
Hundreds of couples were present at the Sabarmati riverfront this morning to celebrate Valentine's Day.
In Srinagar, radical women's outfit Dukhtaran-e-Milat Chief Asiya Andrabi and her three colleagues were detained by police here while carrying out an anti-Valentine's day drive.
In industrial city Jamshedpur, a group of persons chased away lovers assembled at the famous Jubilee Park there and made a bonfire of Valentine's Day greeting cards before being rounded up by the police.
The protests took a rather bizarre turn when a few workers of Hindu Munnani performed the marriage of a goat with a dog in Ooty.
Marking the day in Kolkata, around 70 women from red-light areas of Sonagachi and Munshiganj took out a procession on a two-kilometre stretch in Khidirpore as part of the global One Billion Rising campaign to end violence against women and promote gender equality.