Although the loss of Mosul would effectively end Islamic State's territorial rule in Iraq, U.S. and Iraqi officials are preparing for the group to go underground and fight an insurgency like the one that followed the U.S. -led invasion.
In Iraq, coalition military forces conducted five strikes consisting of 45 engagements against ISIS targets in Mosul, coordinated with and in support of the Iraqi government.
Tense of thousands of refugees have been fleeing the city to escape the fighting.
The worries about civilian deaths have grown as Iraqi forces push to take western Mosul from the Islamic State group (ISIS) with the help of USA and allied air power, rockets and artillery.
However, this technological supremacy didn't prevent collateral damage from taking place, as what happened in Mosul where up to 250 civilians were killed in an airstrike on March 17 that was purportedly launched by the U.S. Army. The strike apparently played a role in collapsing a building that resulted in the death of almost 200 civilians.
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Stephen Townsend, the senior United States commander in Iraq, said coalition forces "probably had a role in those casualties".
Al-Adnani's death came less than six months after two other top ISIS officials - finance minister Haji Iman and No. 3 Omar al-Shishani - were also reportedly killed. The United States has expanded its investigation into a formal review of all airstrikes over several days in the area, the USA military said Thursday.
Townsend's statement only perpetuates the idea that the USA does not have to take any responsibility for civilian casualties overseas in the fight against ISIS or other terrorist organizations.
Data released April 2, suggested a total of 543 Iraqi civilians were killed and 561 wounded, although much of these deaths were attributed to the use of human shields by Daesh.
Previous figures of security members' casualties were questioned by the Iraqi military as "inaccurate", while UNAMI responded that "the military figures were largely unverified". The Iraqi military has suffered enormous casualties - 284 Iraqi troops were killed in the first 37 days of the offensive to take western Mosul - and it depends on USA firepower to advance. Gen. Igor Konashenkov said Sunday in a statement. Instead, the Pentagon is relying on the more than decade-old Authorization for Use of Military Force (AUMF) that Congress passed in the aftermath of the 9/11 attacks.