Metropolitan Police Commissioner Bernard Hogan-Howe wants to cut all crime. He says as far as he is concerned "all crime matters".
He added: "If we can cut all crime then we will end up with a happier and a more confidant London - a place people want to invest, people want to visit and I'm confidant we can do that in the future".
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Arthur Simpson-Kent, 48, admitted killing Ms Blake and their sons according to his lawyer.
Tsvetomir Georgiev, 25, targeted women travelling late at night on the London Underground.