It pisses me off that they got an apology. Although I do suspect the police knew and it was a pr stunt, so they looked like they were supporting the family till it came out.
The mock shock, is designed to spread the fear that no one can tell where the threat will come from. Its designed to make everyone else feel that it can happen anywhere at anytime and you can't predict where or when. Its a terror tactic on its own. It is also, as pp, said a way to try and bleed more money out of the country.