UN, it will backfire big-style. A decision to bomb a flour mill and a sewage plant would have been taken at the highest level, way above pilots and squadron leaders. If the buildings were being used by Hamas fighters, there would be reconnaissance footage from aircraft, UAVs and ground forces to substantiate it. These operational decisions and evidence are all on file in the military these days due to the C3i systems used, where everything is recorded. it would not be possible to overlook them. It would of course be possible to surpress them in an internal, politically-led 'inquiry'. Israel is playing a dangerous game here. If it turns out to be lying about this incident, as seems to be demonstrably the case, then everything else in its report is rendered questionable and indeed dubious. There will have to be a full independent inquiry eventually, the dodgy tricks to avoid it are just storing up problems and proper justice at the Hague is looming ever closer.
Bomb in Lebanon targets bus heading to Syria, no casualties (Reuters)
from the article: Report: UN evidence counters Israel's account of Gaza war