It seems one foreign investor (Arabic guy?) at Brilliance/Zhonghua was not happy with the agreement and went to desperate lengths to bring the case to public attention. The full story, is unknown to China Car Times but these pictures speak for themselves:

‘Brilliance cheat foreign investors!’

Here come the plod, and security.

The crowds go wild! Police knocked out of action!

A press orgy!

The full story comes out! (click for a big picture)
China had a record 87,000 ‘mass incidents’ in 2006 - a mass incident is just like this, a protest, a person who feels let down by the system and has begun raging against the machine with a placard.