Regulator to intensify war on speculation

Risks from program trading are hurting stock market stability

China's securities regulator has widened efforts to stem the stock market slide by investigating the speculative program trading blamed for the surging market volatility.

The move came as the A-share market continued to decline with shrinking turnover and greater volatility amid investors' renewed fears for a second dip after the dramatic sell-off has slashed the benchmark index by some 30 percent since mid-June.