Sir Ian Blair

My respect for Sir Ian Blair, Metropolitan Police Commissioner, has raised considerably. Here

"'They have to be that because there is no point in shooting at someone's chest because that is where the bomb is likely to be,' he said.

'There is no point in shooting anywhere else if they fall down and detonate it.

'It is drawn from experience from other countries, including Sri Lanka. The only way to deal with this is to shoot to the head.'

"The policy had been 'reviewed and reviewed' for many months and was a national one, not just for London, he said.

'I think we are quite comfortable the policy is right but these are fantastically difficult times,' Sir Ian said.

'We have to take this tragedy, deeply regret it and move on to the main investigation which is proceeding at an extraordinary pace.'