The number of civilian causalities from the U.S.-backed battle to retake the Iraqi city of Mosul from the Islamic State was 10 times higher than previously reported, an Associated Press investigation finds. That figure, says a human rights group, shows a brazen disregard for the need to minimize civilian harm.

“We are horrified, but not surprised, by these new figures,” said Lynn Maalouf, head of research for Amnesty International in the Middle East.

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AP says the figure is based on morgue records as well as databases from groups including Airwars, Amnesty International, and Iraq Body Count, as well as a report from the United Nations.

During the military campaign waged from October 2016 to July 2017, AP reports that between 9,000 and 11,000 people were killed; 4,200 were confirmed as civilian dead.

From AP:

Among the chilling details noted in the investigation are that morgue logs indicate many people were killed by being “blown to pieces” in west Mosul, where as ISIS fighters “packed hundreds of families into schools and government buildings,” ostensibly to dissuade airstrikes. That tactic failed.