Boris Johnson said: "Londoners have to be a little bit patient; they have to recognise that this thing (the Olympic Stadium) was not built to be the kind of omni-purpose, world class stadium capable of hosting premiership football that it should be and there's a very clear choice for us all.
"Do we want to rush ahead with a reopening or do we want to go on with the adaptations that will deliver a world class facility?"
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The 47-year-old man died shortly after 3pm on Tuesday.
Specialist explosive detection dogs searched through the town examining letter boxes and phone booths for signs of potential devices.
Temperatures reached 29.1C in St James's Park, central London.