I expect he means anyone that's looks like they may appear to be a muslim.
There's the problem; what does a Muslim look like? The accepted image is a swarthy bloke with fairly short hair and a huge beard. Trouble is, we're talking about a religion, not a genetic trait, so a Muslim can be any race or colour, and obviously you can have Muslims who aren't so strict without the beard, etc, and Arab-looking individuals who aren't Muslim.
I believe part of the reasoning for this attack is to stir up such conflict*, which can then be used as an excuse for further attacks on non-believers, because of attacks on innocent Muslims.
It all becomes horribly circular.
*based on the sort of twisted thinking that some people use to justify such horrifying acts as this.