On July 19, US warplanes dropped bombs on a crowd of civilians in the Syrian village of Tokhar. When the dust cleared, a minimum of 95 people were killed, and some groups claimed that as the wounded began dying, the toll rose to nearly 200.
CENTCOM seems to accept the pieces of this story. There was definitely a crowd of civilians, and there were definitely US warplanes dropping 500-pound bombs on them, and those bombs definitely hit the target. Getting them to the part where bombing a bunch of civilians with deadly explosives meant killing them, however, is a herculean task.