This is difficult, I think the minister is being unhelpful. One assumes that terrorists will be clever and merge with the population and try not to be obvious. There is a real threat that someone and others professing islamic beliefs will at some stage succeed in committing a terrorist atrocity here. This is matter for the intelligence services and criminal investigators to deal with.
It is important though that the mainstream of the muslim community be involved in assisting the authorities in apprehending culprits. Therefore some calm and wisdom needs to be employed and the investigating authorities should be allowed to their job without politicians blabbing.