In the push, Iraqi forces retook several villages on the outskirts of the town of Makhmour, east of Mosul, early in the morning today and hoisted the Iraqi flag there, according to the spokesman for the Joint Military Command, Brigadier general Yahya Rasool.
It was not immediately clear how long such a complex and taxing offensive would take.
Only recently, Iraqi and US officials refrained to give a specific time on when the Mosul operation could begin, saying it would take many months to prepare Iraq's still struggling military for the long-anticipated task of retaking the key city.
Iraqi state-run TV interrupted its morning program today with a series of news alerts announcing the operation and broadcasting patriotic songs and flag-waving video clips. Rasool told The Associated Press that the US-led international coalition was providing air support but would not divulge more details on the offensive, which he said was dubbed "Operation Conquest."
Mosul, Iraq's second-largest city, fell to Islamic State group during the militants' June 2014 onslaught that captured large swaths of northern and western Iraq and also neighbouring Syria.
Rasool's declaration came only few days after the United States announced that it has set up a small Marine artillery outpost in northern Iraq to protect a nearby Iraqi military base in Makhour.
On Saturday, the militants fired to rockets at the base, killing a US Marin and wounding several others.
