Hong Kong's benchmark stock index fell to its lowest since mid-2013 on Thursday, as panic from China's 7 percent market free-fall spilled over the border.
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The Hang Seng index dropped 3.1 percent, to 20,333.34, the lowest close since July 2013.
The China Enterprises Index tumbled 4.2 percent, to 8,753.97 points, a closing level not seen since October 2011.
All main sectors fell, with sentiment soured by the fresh slump in mainland equities.
China's benchmark CSI300 index collapsed 7 percent after less than 30 minutes of trading, triggering the circuit breaker mechanism that halted share transactions for the day.
The tumble in China was triggered by a further weakening in the yuan, gloomy prospects for China's economy and fears of an equity supply glut when a share-sales ban expires on Friday.
(Reporting by Samuel Shen and Pete Sweeney; Editing by Richard Borsuk)