Asian stocks dropped, with the regional benchmark index headed for the biggest two-day loss in seven weeks, after a Chinese central bank adviser forecast economic growth will slow further and on renewed concern that Greece may not meet its bailout targets.

Nikkei 225 8,508.32 -161.55 -1.86%

S&P/ASX 200 4,128.9 -70.22 -1.67%

Shanghai Composite 2,141.39 -27.24 -1.26%

Samsung Electronics Co., which gets 47 percent of its revenue in China and Europe, lost 2.4 percent in Seoul.

HSBC Holdings Plc, Europe’s largest bank, slumped 4.6 percent, its biggest drop since November.

BHP Billiton Ltd., the world’s No. 1 mining company, lost 2.6 percent in Sydney amid concern about global economic growth.

Gauges of volatility in Asia rose, reflecting increasing risk aversion among investors.