Well, that's a relief.

Turns out that fiery mushroom cloud that erupted a mile high over Beijing was just a couple of errant farmers burning a dozen or so bales of straw.

In fact, the Chinese government was so confident the whole shebang was much ado about nothing, they took the time out of their busy schedules to arrest anyone who claimed otherwise.

From MSN.com:

Beijing residents can be forgiven for freaking out over the weekend when it looked like evidence of an atomic bomb explosion loomed over their city. Rumors about what caused the multicolored haze flew around the Internet, which -- no surprise here -- led to Chinese police arresting those who dared to suggest online that it was pollution caused by a chemical leak or refinery explosion. The government says the phenomenon was simply an unfortunately shaped cloud that resulted from farmers burning straw in the fields.

Calm down, bro. It's just straw.