Recent reports out of ISIS’s final Iraqi stronghold, Mosul, indicate at least 100 civilians died in airstrikes almost certainly carried out by the US-led coalition’s air campaign against the terror group.

While the Pentagon has denied loosening its rules of engagement, an Associated Press report last month quoted a spokesman for the coalition, Air Force Col. John Dorrian, as saying US operators no longer needed to clear airstrikes with a Baghdad office, empowering coalition forces to more easily call in airstrikes.

Business Insider reported that although the rules of engagement had not changed, procedures leading up to strikes had, so any coalition forces on the ground had a freer hand to call in airstrikes.

This adjustment in tactics seems to have had grave results.