(ABC News) -- They're rehearsing in London with the $42 million opening ceremony extravaganza just hours away.
But the city is on edge about the Olympic games. And comments made by Mitt Romney didn't help.
Presumptive Republican presidential nominee Mitt Romney's comments to NBC set off a firestorm in London. The city's mayor reacted in front of 60,000.
"There's a guy called Mitt Romney who wants to know whether we're ready," said Boring Johnson, Mayor of London. "Are we ready?"
Romney later clarified his comment and even admitted that he made mistakes when he headed the 2002 Salt Lake City games.
So is London ready?
"Our absolute top priority must be to keep people safe," said British Prime Minister David Cameron.
British Prime Minister David Cameron says security plans include extra police on the ground in the sky and on the water. The British military is also helping.
There were jitters earlier in the week. A fighter jet scrambled to meet a plane that lost communication and the evacuation of mall near the Olympic park after a fire alarm went off.
Whether London's ready or not, the Olympic athletes say they're ready to go for the gold.