Suicide bombing, shootouts kill around 55 in Iraq
"The hour has come and the moment of great victory is near," he said in a speech on state TV, surrounded by the armed forces' top commanders. "I announce today the start of the operation to liberate the province of Nineveh."
The assault on Mosul is backed the US-led coalition and could be one be the biggest military operations in Iraq since the 2003 US-led invasion that toppled Saddam Hussein.
IS drone kills Kurdish fighters, hurts French troops
"We are proud to stand with you in this historic operation," Brett McGurk, US envoy to the coalition against Islamic State, said on Twitter at the start of the Mosul offensive.
Mosul is the last major stronghold of ultra-hardline Sunni group in Iraq.
US tries to defuse Iraq-Turkey war of words over Mosul
With a pre-war population of around 2 million, the northern Iraqi city is the largest city Islamic State has controlled after it declared a "caliphate" in Iraq and neighboring Syria in 2014.
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