Police chief urges Britons to be vigilant
Commissioner Stevens told BBC Radio: “The threat is different in terms of suicide attacks. The activity and the actual threat has taken a quantum leap since September 11. Everyone needs to know that.”
Asked whether activity by the security services had prevented terrorist incidents over the last year, he said: “That is absolutely right, there is no doubt about that. The hard work has been successful, but we must not be complacent. We really must be vigilant.”