Elite special forces pushed into the Karama and Quds neighbourhoods, while army troops and federal police advanced into nearby Intisar, Salam and Sumor neighbourhoods. Smoke rose across the city as explosions and machine gun fire echoed through the streets.
Stiff resistance by the militants, civilians trapped inside their houses and bad weather have slowed advances in the more than two-month-old offensive to recapture Iraq's second largest city, the extremist group's last urban bastion in the country. It is the biggest Iraqi military operation since the 2003 US-led invasion.
The special forces, officially known as the Counter Terrorism Service, have done most of the fighting, pushing in from the east. But regular army troops on the city's southeast and northern edges, as well as militarised federal police farther west, have not moved in weeks, unable to penetrate the city.
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He said he expected Iraqi forces would drive IS from Mosul and the rest of Nineveh province within three months. Iraqi leaders had previously vowed to drive the extremists from Mosul by the end of the year.
The city is still home to around a million people. Some 120,000 have fled since the operation began on October 17, according to the United Nations.
Meanwhile today, separate attacks in and around Baghdad killed at least 13 people and wounded 35 others, police said. The deadliest took place in the capital's southwestern neighbourhood of Maalif when an explosives-laden vest was detonated near an outdoor market, killing seven and wounding 12, police added.