(CNN)At a time of growing concern about civilian casualties in Iraq, the US-led coalition issued a report Saturday that says at least 229 civilians likely have been killed by coalition strikes there and in Syria since Operation Inherent Resolve began nearly three years ago.
The number could grow significantly if an investigation into airstrikes on a neighborhood in Mosul, Iraq, in mid-March finds the operation unintentionally killed scores of residents.
An senior Iraqi health official told CNN earlier this week that 112 bodies were recovered from the Mosul site.
The US military is conducting a formal review of the strikes.
Another 43 reports of civilian deaths — 23 from Iraq and 20 from Syria — are being assessed, the coalition said. Twelve of 17 reports from February already assessed lacked credibility, it said.
“We regret the unintentional loss of civilian lives resulting from coalition efforts to defeat ISIS in Iraq and Syria and express our deepest sympathies to the families and others affected by these strikes,” the task force said in a statement.
The coalition said more than 18,600 artillery strikes or airstrikes took place between August 2014 and the end of February.
Military officials have pointed to a new ISIS tactic of forcing civilians into buildings as one of the reasons for the recent increase in the danger to civilians.
US Col. Joseph Scrocca told reporters the coalition was making adjustments in the wake of this new threat but would not elaborate because of operational security reasons.
One human rights organization, Amnesty International, has called for the military to change its rules of engagement.
“(ISIS) shamefully resorts to using civilians as human shields, a serious violation of the laws of war that amounts to a war crime. In a densely populated residential area, the risks for the civilian population become enormous,” said Donatella Rovera, a senior crisis response adviser.
“However, (ISIS’s) use of human shields does not absolve Iraqi and coalition forces from their obligation not to launch disproportionate attacks.”