It's pertinent to those saying shut the borders. Germaine Lindsay was of Jamaican origin and wasn't even born a Muslim. Hasib Mir Hussain was a second generation Briton, meaning his parents were born here as well. The other two were first generation Britons but grew up living entirely ordinary lives. Something happened to these four boys to turn them into religious fanatics and murderers. That's the thing we have to tackle, which we can probably do reasonably well in this country but when people can log onto the internet or hop on a plane to Karachi then there's little we can do ourselves.