China suspended stock trading on Monday after weak manufacturing data spooked investors and sent shares plummeting.
The benchmark Shanghai Composite shed 6.9%, while the Shenzhen Composite lost more than 8%.
The trading halt was China's first-ever use of circuit breakers -- a kind of emergency brake -- on main exchanges.
Investors were reacting to disappointing manufacturing data, which suggested the country's all-important factory sector is in for more pain. After improving for two months, Caixin's manufacturing PMI fell to 48.2 in December. Any number below 50 represents a deceleration.