A wave of exceptionally hot weather has blasted the region over the past week, sending the mercury as high as 45 degrees Celsius
The benchmark Shanghai Composite Index dipped 0.89 percent at 3,203.56 points.
The Shenzhen Component Index opened 0.87 percent lower at 10,706.23 points, Xinhua news agency reported.
The ChiNext Index, China's NASDAQ-style board of growth enterprises, opened 1.24 percent lower at 2,056.29 points.
A journalist, an official with China's securities watchdog and four senior executives of CITIC Securities, China's largest brokerage, were placed under "criminal compulsory measures" on Sunday for market manipulation and trading violations.
Since mid-June, China has rolled out a slew of measures to stabilize its volatile stock market, with a focus on pumping funds into the system.
Despite this, key indices have continued to nosedive over the last fortnight. This crackdown on illegal trading indicates that the government is diversifying its measures.
A wave of exceptionally hot weather has blasted the region over the past week, sending the mercury as high as 45 degrees Celsius
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