Indeed has ended in chaos at least my bet will be voided as it wasn't looking too good. Apparently one of the fans rioting even had a gun in their possession. Crowd trouble in South America not exactly rare from what I've heard. Shows how bad crowd trouble can truly be Rooney, Ferdinand and co wouldn't dare act like they did there!
Rocks thrown at the Tigre coach before the game too by Sao Paulo fans. Over 80,000 in attendance apparently.
Also due to Tigre refusing to return to the pitch (quite justifiably really) the game may have been awarded to Sao Paulo! Tigre also reporting their players being beaten by security.