Iraqi troops backed by US-led air strikes have pushed deeper into eastern Mosul after a two-week lull in the operation to retake the city held by the Islamic State of Iraq and the levant (ISIL, also known as ISIS) group.
Staff Lieutenant General Abdulghani al-Assadi, a senior officer in Iraq's counterterrorism service, said the second phase of the operation, now in its third month, began on Thursday.
He told the AFP news agency that forces began advancing towards the Quds neighbourhood.
"Now our forces clashed with the enemy and there is resistance," al-Assadi said, adding that forces on the northern and southern fronts were also advancing.
Special Elite Forces also pushed into the Karama neighbourhood, while army troops and federal police advanced into nearby Intisar, Salam and Sumor neighbourhoods, the AP news agency reported.
Smoke rose across the city as explosions and machine gun fire echoed through the streets.
Stiff resistance by ISIL fighters, civilians trapped inside their houses and bad weather have slowed advances in the offensive to recapture Iraq's second largest city, the armed group's last urban bastion in the country.
It is the biggest Iraqi military operation since the 2003 US-led invasion.
ISIL overran large areas north and west of Baghdad in 2014, but Iraqi forces backed by US-led air strikes have since regained much of the territory they lost to the group.
Iraqi Prime Minister Haider al-Abadi had pledged that Mosul would be recaptured by year's end. That goal that is now out of reach, as operations in western Mosul have yet to begin.
Abadi said earlier this week that three months were needed to eliminate ISIL in Iraq.
However, Lieutenant Gen. Stephen Townsend, the general commanding coalition forces in Iraq, predicted that it would take two years to clear ISIL from Mosul and Raqqa, and then to burn out the remnants of the group.
Source: News agencies