Here's an MSNBC article
Here
There are survivors and no current reports of casualties but those may come. It happened while landing in very severe weather. The plane apparently skidded off of the runway. It may have landed fast due to wind sheer in the area and was unable to stop, but that's nothing more than conjecture at this point.
As far as I can recall, this is the first major accident of an Airbus A-340.