China stocks fall despite fresh policy support, Hong Kong up

SHANGHAI (Reuters) - China stocks had another highly volatile session by midday on Thursday despite fresh government measures aimed at putting a floor under the market's recent sell-off. Hong Kong's benchmark Hang Seng index rose, a day after markets were closed for a holiday, taking cues from global equity markets. Late on Wednesday, China's securities regulator relaxed rules on using borrowed money to speculate on stock markets, letting brokerages set their own tolerance level o