tl;dr: Scary pics.
Looks like an EV bus caught on fire in Shanghai yesterday – specifically, a hybrid ultracapacitor/Li-ion bus. Thankfully no one appears to be hurt, but doubtless this is going to call into question the safety of the current generation of Li-ion batteries. More detail at Green Car Reports.
[Photo via Eastday, with lots more scary-looking ones where that came from.]
Secret Formula 
It should raise questions about the quality and integrity (or lack thereof) of Chinese manufacturing. This has not happened with US manufactured hybrid buses containing battery systems by A123 (yes I own a very small stake). Only bad battery among the thousands installed can cause problems if the batttery management system and/or cooling system are not working correctly.
People want energy that is portable, inexpensive, doesn’t pollute and is safe – good luck with that.