Asian stocks sank, with the regional benchmark index headed for the biggest drop since November 2011, as Japanese shares plummeted after China's manufacturing output unexpectedly contracted and the yen strengthened. Futures trading in Osaka was suspended as Japan's Nikkei 225 Stock Average and the broader Topix Index both fell as much as 6 percent, the most since the aftermath of the 2011 earthquake.

Nikkei 225 14,483.98 -1,143.28 -7.32%

S&P/ASX 200 5,062.4 -102.97 -1.99%

Shanghai Composite 2,275.37 -27.03 -1.17%

Jiangxi Copper Co., China's biggest producer of the metal dropped 3.3 percent in Hong Kong.

Toyota Motor Corp. fell 4.1 percent in Tokyo, pacing declines among the region's exporters amid speculation the Federal Reserve may soon wind back stimulus.