Coalition-attributed civilian casualties in Syria were up during May, while those blamed on Russia were sharply down.
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.
Civilian fatalities from international military actions in both Iraq and Syria were at record low levels during April.
More than 1,200 civilians were alleged killed by Russian actions in Syria during March – setting a grim new record
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
Tens of thousands of US bombs and missiles helped drive Islamic State from Raqqa. But now the dead are being forgotten.