Chinese equities plunged the most in five years, led by brokerages, after regulatory efforts to rein in record margin lending sparked concern that speculative traders will pull back from the world's best-performing stock market.
The Shanghai Composite Index sank 6.3 per cent to 3,163.72 at 11.30am local time.
Chinese brokerages' shares plunged after the securities regulator suspended three of the biggest firms from adding margin-finance and securities lending accounts for three months following rule violations.
Citic Securities, the nation's biggest broker, fell 14 per cent yesterday. Haitong Securities and Guotai Junan Securities were among others whose shares tumbled.
The trio were suspended after letting customers delay repaying financing for too long, the China Securities Regulatory Commission said, without giving more details.