China stocks look set for biggest monthly loss in six years
* CSI300 -0.1 pct; SSEC -1 pct; HSI 0.4 pct
* Regulator investigates automated trading
* Market set for rebound -analyst
HONG KONG, July 31 (Reuters) - China stocks fell on Friday and looked set to suffer their biggest monthly loss in nearly six years even as Beijing rolled out a series of support measures and promised to step up efforts to bolster the flagging economy.
Stocks have plunged more than 30 percent since mid-June, threatening further risks to an economy that is expected to post its slowest growth in a quarter of a century this year.
The Shanghai Composite Index fell 1 percent to 3,669.45 points in morning trade. For the month so far, it has slumped 14.2 percent, the biggest monthly drop since August 2009.
The CSI300 index dipped 0.1 percent to 3,812.34.
China CSI300 stock index futures for August fell 0.1 percent to 3,678.6, but was still 133.74 points below the current value of the underlying index, pointing to investor expectations of further losses.
Still, some analysts said a flurry of unprecedented support measures by Beijing in recent weeks may be slowing putting a floor under the market, even if it remains vulnerable to wild daily swings. Continuación...