Investigators traveled to Raqqa and spoke with more than 100 witnesses and victims, with their report highlighting the deaths of dozens of members of just four families.
Thousands of civilians were killed during the battle for Mosul, but there is no official death toll.
Australia remains the only American ally to admit any civilian harm after almost four years of strikes
Significant civilian casualties continued from reported Russian strikes in Syria’s eastern Ghouta; and from Turkish actions in Afrin
Thirty months into its Syria campaign, Russia is reportedly killing more civilians than ever
Iraqi forces supported by the international Coalition have driven so-called Islamic State from the nation’s cities and towns. The cost in lives has been significant.
US-led alliance has still made no public comment on 18-month investigation, which found that deaths from Coalition airstrikes were up to 31 times higher than acknowledged.
As strikes targeting ISIS in Iraq wind down, an air-backed race against Islamic State in Syria has put civilians in extreme danger.