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From BBC news:

The London 2012 Olympics will show the world "beyond doubt that Britain can deliver", the prime minister has said.

"Look at what we're capable of ... even at a difficult economic time," he said, after US presidential candidate Mitt Romney raised doubts about the Games.

At the Olympic Park in east London, David Cameron said: "This is a great moment for us. Let's seize it."

Olympic organisers have apologised to North Korean athletes whose images were shown next to the South Korean flag.