After eight months of grinding urban warfare, Iraqi government troops on Thursday captured the ruined mosque in Mosul from where Islamic State proclaimed its self-styled caliphate three years ago, the Iraqi military said.

Iraqi authorities expect the long battle for Mosul to end in the coming days as the remaining Islamic State fighters are now bottled up in just a handful of neighborhoods of the Old City.

The seizure of the 850-year-old Grand al-Nuri Mosque is a huge symbolic victory for the Iraqi forces fighting to recapture Mosul, which had served as Islamic State's de facto capital in Iraq.

"Their fictitious state has fallen," an Iraqi military spokesman, Brigadier General Yahya Rasool, told state TV.