Boris Johnson has said he wants the reportedly British jihadist who beheaded American journalist James Foley to be killed in a bomb attack.
The Mayor of London said Britain must take on Islamic State (IS) and "try to close it down now", warning that doing nothing would mean a "tide of terror will eventually lap at our own front door".
Mr Johnson, who has overall responsibility for the Metropolitan Police and is planning to return to parliament next year, called for new laws that would mean anyone visiting Iraq and Syria would be automatically presumed to be terrorists unless they had notified the authorities in advance.
Mr Johnson added: "Young men such as this killer are famously told that if they die in 'battle' they will be welcomed in heaven by the sexual ministrations of 72 virgins.
"Many of them believe it - even though scholars have suggested that the reference to 'black-eyed virgins' is in fact a promise of 72 raisins.
"I suspect most of us don't give a monkey's what happens to this prat in heaven, whether he meets virgins or raisins - we just want someone to come along with a bunker buster and effect an introduction as fast as possible."