Asian stocks and emerging market currencies tumbled on Wednesday and commodities fell after China allowed the yuan to fall sharply for a second straight day, forcing investors to seek refuge in safe-haven government debt.

On Wednesday, the People’s Bank of China set the yuan’s midpoint rate weaker than Tuesday’s closing market rate, which had already fallen sharply after China devalued its currency by 2 per cent in a surprise move.

The central bank had billed Tuesday’s change as a free-market reform but experts suspect it could be the beginning of a longer-term slide in the exchange rate aimed at making China’s ailing exports more competitive.

The rapid drop in the value of China’s currency — around 4 per cent in the last two days — dealt a body blow to appetite for risky assets globally, with equities, currencies and commodities coming under selling pressure as money managers feared it could ignite a currency war that would destabilise the global economy.

MSCI’s broadest index of Asia-Pacific shares outside Japan fell 1.7 per cent to two-year lows. Stock markets from Australia to Singapore were a sea of red in early deals.

“China's currency moves will hurt appetite for risky assets such as equities and commodities,’’ said Rajeev De Mello, head of Asian fixed income at Schroders in Singapore which manages $10 billion in Asia.

“While it is too early to say whether this is the beginning of a sustained devaluation of the yuan, other central banks may be forced to follow suit and that may trigger a fresh round of currency weakening around the emerging world.’’

At Wall Street, the Dow fell 1.2 per cent and the S&P 500 shed 1 per cent as China’s currency move added to worries about the global economic outlook and hit companies with large exposure to the country.

Many Western firms have already been reporting slowing sales in China as its economy cools and shares of companies from German auto makers to luxury good makers are expected to come under pressure.

Emerging market currencies from Indonesia to Brazil reeled as investors feared central banks around the world could rush to weaken their own currencies in response to China’s move.

That meant only the greenback was left standing tall with the US dollar holding near a two-month high of 125.17 yen, while the broad dollar index was stuck within recent trading ranges.

Currencies considered as China proxies were singled out for special punishment, with the Australian dollar nursing losses at 0.7255 per dollar after falling more than 1.5 per cent overnight.

“The bottom line is that we believe investors will orientate portfolios towards more rate cuts rather than currency weakness. Real rates are way too high, in our view,’’ wrote Sean Darby, chief global equity strategist at Jeffries.

Commodities investors worried that prolonged yuan weakness could revive deflationary pressures, with a 19-commodity Thomson Reuters/Core Commodity CRB Index holding near lows not seen since 2003.

US crude oil futures fell more than 4 percent overnight to a six-year low before managing to recover 1.1 per cent to $43.57 a barrel early on Wednesday.

Copper and aluminium also hit six-year lows on Tuesday as the cheaper yuan fuelled worries the world’s top metals consumer would cut back on imports.

Copper posted a modest bounce after the overnight slide, with three-month copper on the London Metal Exchange (LME) edging up 0.7 per cent to $5,159 a tonne.

Bonds were the solitary bright spot, with the benchmark 10-year Treasury note yield holding near a three-month low of 2.09 per cent hit overnight.

Its 10-year Japanese counterpart fell to fresh a three-month trough of 0.37 per cent.

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