In a painful echo of the summer rout that wiped trillions of dollars off valuations, mainland investors sold up on fears about the world's number two economy, a key driver of global growth.
The losses mark one of the worst starts to a trading year for decades as nerves are shedded by a perfect storm of weak global growth -- particularly in China -- a slump in oil prices to more than 11-year lows and geopolitical tensions.
Regulators in China called an end to trade within just 30 minutes of opening after the central bank weakened the value of its yuan currency by 0.51 per cent against the dollar.
The drop was the biggest since August when the value was cut by five per cent in a week -- sparking weeks of global market turmoil over worries Beijing did not have a handle on its economic crisis. The yuan is now at its weakest in five years.
AFP