Iraqi forces move to retake another Mosul neighborhood

IRBIL, Iraq -- Iraqi troops gained a foothold Tuesday in another neighborhood in the northern city of Mosul after fierce battles against Islamic State militants dug in behind heavy fortifications, according to a top Iraqi commander.

A new analysis, meanwhile, has found there is a high risk IS will use chemical weapons against Mosul civilians or Iraqi troops fighting to retake the city.

According to IHS Markit, the extremist group has used chemical weapons at least 52 times in Iraq and Syria since 2014, including 19 times in the Mosul area alone.

Brig. Gen. Haider Fadhil of the Iraqi special forces said IS fighters were firing rockets and mortars as his forces "cautiously" advanced in the densely populated Zohour neighborhood.

"There are too many civilians still living there," he said.

Iraqi troops began their siege of Zohour on Sunday as they fortified their positions in neighborhoods already retaken in eastern Mosul.

Suicide bombings, sniper fire and concerns over the safety of civilians -- there are 1 million still in Mosul -- have combined to slow progress in the campaign to liberate the city, which began Oct. 17.

Mosul is Iraq's second-largest city and the largest to have fallen to the militants. Most gains in the campaign so far have been made by the special forces operating east of the Tigris River. Other forces, including the Kurdish peshmerga and volunteer Sunni militiamen, are advancing on the city from different directions, and the U.S.-led coalition is providing airstrikes and other support.

A coalition airstrike Monday destroyed a major bridge over the Tigris in the southern part of Mosul, cutting IS supply lines to the east bank, where most of the fighting is taking place.

The coalition has destroyed three bridges in Mosul, and Iraqi officers said two remaining bridges in the city also likely will be hit. They spoke on condition of anonymity because they were not authorized to brief reporters.

The Iraqi troops are expected to use U.S.-made pontoon bridges when they need to cross the Tigris later in the campaign.

IS captured Mosul in a matter of days in the summer of 2014, when it swept across northern and central Iraq. IHS Markit, a London-based intelligence analysis firm, said the extremists later used the city as a center for the production of chemical weapons.

The experts believe IS moved the materials and its chemical-weapons specialists out of Mosul before the Iraqi offensive, but still may use crude chemical weapons such as chlorine and mustard agents as the troops press deeper into the city.

Iraqi Foreign Minister Ibrahim al-Jaafari meanwhile told reporters during a visit to Budapest that 1,700 militants have been killed and 120 captured since the battle for Mosul began. A third of Ninevah province, where Mosul is the capital, has been liberated so far, he said, adding that progress in the city has been slowed by the militants' use of human shields.

He said that because of Iraq's "extraordinary situation," it would need to increase its crude oil output, which provides 90 percent of state revenues, and be exempt from OPEC quotas.