Asian stocks fell, with Japanese shares leading declines across the region as the yen gained for a fourth day and metals prices dropped.

Nikkei 225 13,824.94 -576.12 -4.00%

Hang Seng 21,573.35 -350.35 -1.60%

S&P/ASX 200 5,011.3 -94.33 -1.85%

Shanghai Composite 2,046.78 -13.72 -0.67%

Pioneer Corp.  sank 8.7 percent in Tokyo after the maker of car stereos lowered its full-year profit forecast.

BHP Billiton Ltd., the world’s biggest mining company, dropped 2 percent in Sydney after copper futures declined.

The MSCI Asia Pacific Index slid 1.9 percent to 133.26 as of 4 p.m. in Tokyo, with more than four shares falling for each that rose.