Dhaka, Oct. 22 -- On the evening of September 4, an illuminated signboard lit up a predominantly Muslim neighbourhood in Kanpur, an industrial town in India's northern state of Uttar Pradesh.

The signboard said: "I love Muhammad" - with a red heart standing in for the word, love.

It was the first time the mainly working-class residents in Kanpur's Syed Nagar had put up such a sign as part of the decorations as they joined millions of Muslims around the world to celebrate Prophet Muhammad's birthday.

The day, marked as Eid Milad-un-Nabi across South Asia, involves the faithful organising religious gatherings, Quran recitations, and sermons about the prophet's life and teachings.

At some places, the celebrations include mass processions, ...