Forget about Fukushima. It's toast. Start worrying about the US and the Pacific ocean.
Overnight trading in DJIA futures stopped at 00:20 when the ticker was at 10,912. It started up again an hour later and is now at 10,935.
It is presumed in the market that if the DOW drops below 10,900 there is no more support above about 9,600. Someone stopped the rout.
ARTIFICIALLY. That means the market is not responding – it is being manipulated. Don't buy into it.