The benchmark S&P 500 index is up over 9% for the year
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.
The benchmark S&P 500 index is up over 9% for the year
Ministry of Foreign Affairs says the decision comes in light of the escalating severity and scope of Israeli attacks against civilians
The US secretary of state agrees that Israeli forces had killed more civilians than Hamas militants
The US president said that a ceasefire would be possible "tomorrow" if Hamas gave up Israeli hostages
American tech companies in general are seen as hostile toward unionisation efforts, notably Amazon
The Serb blamed Friday's incident when he was accidentally struck on the head by a fan's water bottle while signing autographs
Daniel Duggan's lawyer says his client knew Chinese defence hacker Su Bin as an employment broker for Chinese state aviation company
Eastern parts of the city have been heavily bombarded in recent days, as Israel sent tanks and ground troops into the areas