No I am serious, if you are comparing murders, you should include all weapons!
There are regional differences! Fire arms are heavily regulated and relatively hard to get in EU. We are close to war zones, hand grenades are easier to smuggle, and are used in Sweden.
If you include murders by knife, London is worse than US!
Edit: also you wrote "assault" that could include anything from armed robbery without health injury, to self defense. Apples and oranges!