Good guess. Fallujah is well referenced and the sources claim deliberate intent. Omagh seems to fail that test. Kind David is somewhere in between. Mind you. If killing civilians is an inevitable consquence of the bombing; (it was not in Omagh, it certainly was in US bombing of civilian areas and I'd need to read up on King David). I'd say dropping a 1,000lb bomb at high speed from the air is de facto intent to kill civilians; ground bombs, be they car bombs or suicide bombs may or may not be.