Security has been tightened in Mathura on the anniversary of the Babri Masjid demolition in Ayodhya in 1992.
There is tension in Mathura after right-wing Hindu groups were denied permission to install an idol of Lord Krishna inside a mosque in the city.
The Akhil Bharat Hindu Mahasabha and a few other groups had sought permission to install a Krishna idol at the deity's "actual birthplace", which it claimed is in a mosque close to a prominent temple.
The district administration denied permission to the event that may potentially disrupt peace.
The right-wing groups had said that they would install the idol in the Shahi Idgah after a "maha Jal Abhishek" to "purify" the place.
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The area in which the Katra Keshav Dev temple and the Shahi Idgah fall has been demarcated as the red zone and heavy security has been deployed.
The threat to perform the ritual inside the Shahi Idgah comes at a time when the local courts are hearing a series of petitions seeking the "removal" of the 17th-century mosque.
UP deputy CM had last week stirred the political cauldron by saying that the BJP was preparing to build a temple in Mathura.