The flag of the Islamic State (IS) was waved at a rally at the Jama Masjid in the Nowhatta area of Srinagar.
After the black flag was unfurled, cries of ‘Jeeve Jeeve Pakistan’ were also heard.
Those in the rally later blocked the road leading to the mosque and took to stone pelting, targeting nearby security forces.
Hurriyat hardliner Mirwaiz Umar Farooq was also seen at the venue.
Further details are awaited.