Jim is absolutely right. No one is ever safe from a determined individual (or couple), but that does not mean we have to jump at shadows. Or, far worse, put in place meaningless "security measures" that make the situation worse by making everyone tense. I am heartily sickened by the exaggerated responses in some quarters calling for the death penalty (surprise, surprise) to mass deportations. We have here a couple of psychopaths, locals to judge by the accent, who have murdered a stranger and tried to claim some justification. If they were white locals who claimed they were told to kill someone by Ming the Merciless of the planet Mongo, we would shake our heads, try them and lock them up. This should be treated no differently. That is the strongest response anyway to "terrorists" - protect our culture by maintaining its standards whatever they do.