Officially 484 civilian have been killed in the US-led coalition attacks, but outside monitors put the number much higher.
The US military said that coalition attacks on ISIL targets in Syria and Iraq have killed more than 480 civilians since mid-2014 - a tally that is far below those of outside monitors. US Central Command said in a statement on Friday that it added an additional 132 civilians deaths to its April report, a sharp increase from 352 it previously reported in late April.
However, that total, which only includes civilian deaths through April, was still far short of what non-governmental organisations and monitors have estimated.
Airwars, a London-based collective of journalists and researchers that tracks civilian deaths in Syria and Iraq, estimated more than 3,800 non-combatants have been killed since the US-led coalition's operations began in August 2014.