China shares plunge over 5% at open as brokerages tumble on margin trading crackdown

SHANGHAI (Reuters) - China's key stock indices fell over 5 per cent at open on Monday with financials falling sharply after the securities regulator punished top brokerages for illegal doings in their margin trading business.

The Shanghai Composite Index fell 6.3 per cent while the CSI300 index of top Chinese companies was down 6.1 per cent.