Via Popular Science.
I saw a report about this on the local news (which is to say that they were just showing a report from ABC News) and apparently some people in Chelyabinsk thought Russia was being attacked. Good thing the Russian government didn't or else we might be reenacting Fallout 3. :P
Pretty crazy though, especially with an asteroid passing close to the Earth at around the same time. According to scientists, the two events are unrelated.