Boris Johnson said the "Olympo-sceptics" were proved wrong by success of the London 2012 Games after it was announced the Olympics gave the UK economy a £9.9 billion boost.
The Mayor of London said the country would now "defy the doom-mongers" when it comes to securing a permanent Olympic legacy.
"London is succeeding where virtually no other host city has, on track to secure a solid gold payback on the taxpayers' outlay and a rosy future for the Queen Elizabeth Olympic Park", Mr Johnson added.
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Millions have stopped to watch the sun blotted out for a total solar eclipse across a swathe of North America.
Officials said Younes Abouyaaqoub was killed in the town of Subirats, 30 miles west of Barcelona.