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.]