LUCKNOW, Jan. 3 -- Days after a video showing a man urinating at Bhool Bhulaiya inside the historic Bada Imambara went viral on social media, Lucknow police on Friday registered an FIR against an unidentified person, officials said.

The undated video, which has been widely circulated online over the past few days, shows a man relieving himself against a wall at Bhool Bhulaiya within the Bada Imambara complex, a site of religious, cultural and historical significance. The footage triggered widespread outrage, with users demanding strict action against the man for disrespecting a protected monument.

"Taking cognisance of the viral video, an FIR has been registered against an unknown accused at Chowk police station. Efforts are underway to...