Gen Shaaban Nasiiri was an adviser to Qassem Soleimani, the head of Iran's elite Quds Force. Soleimani has acted as a key adviser to Iraq's Popular Mobilization Forces an umbrella group of Mostly Shiite militia forces sanctioned by the Iraqi government in the fight against IS since 2014.
The Iraqi official, speaking on condition of anonymity in line with regulations, said Nasiiri was killed yesterday and is the first senior Iranian commander to die in the Mosul fight.
The IS hold on Mosul has shrunk to just a handful of neighborhoods in and around the Old City district where narrow streets and a dense civilian population is expected to complicate the fight there.
Iraqi planes dropped leaflets over the area Friday telling civilians to flee "immediately" to "safe passages" where they will be greeted by "guides, protectors and (transportation) to reach safe places," according to a government statement.
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The move to clear the Old City marks a shift in approach. Since the Mosul operation was launched in October, Iraqi forces have encouraged civilians to remain in their homes to avoid massive displacement. However, more than 730,000 people have fled the fight to date according to United Nations figures.
"As many as 200,000 additional people may try to leave in coming days," the UN said today in a statement following the call for Old City civilians to leave. Save the Children warned that fleeing civilians could be caught in the crossfire, leading to "deadly chaos" in a statement yesterday.
More than 100,000 civilians are estimated to still be inside IS-held Mosul neighbourhoods.
While US-backed forces have fought inside Mosul during the operation to retake it from IS, Iraq's Popular Mobilization Forces have largely operated in the deserts to the west cutting supply lines and attempting to begin securing Iraq's border with Syria.