It was not too long ago (April 18 to be exact) Shanghai Composite Index hit a low of this year. Shortly after that Chinese goverment issued new policies trying to stablize the market. Well, it looks like we need the goverment do something about the market again: on June 10 the Shanghai composite dropped 257 points (7.73%), and closed at a new low of 3072. More than 1000 stocks dropped 10% in Shanghai and Shenzhen markets (see below).
(source: finance.cn.yahoo.com; full size picture here)