shoot to kill, to prevent them detonating anything

Her's a hint for would be suicide bombers- make a 'dead man's handle' for your bomb- just a button that you have to press every 10 seconds say, otherwise the bomb goes off. Schoolboy electronics, cost a few pence.

I say this not to help the bombers, but so that if they adopt this, the police will have less motivation shoot people on suspicion.

I rather think the bombers would prefer to have everyone scared, not just of being blown up by the enemy, but shot by our own 'protectors' as well.