China producer price index up 8.1 percent in April

China is struggling to rein in inflation, and the greater-than-expected price gains in raw materials and industrial inputs suggests that recent state media reports of a rapid moderation in the consumer price index may have been premature.

"So far this year, China's economy has continued to grow at a fast pace," Vice Premier Wang Qishan told a financial conference in Shanghai on Friday. "However, the economy is also facing some problems, mainly reflected in relatively high consumer prices and fixed-asset investment."

Authorities must prevent "fast money supply growth from becoming excessive and structural price increases from escalating to a severe overall inflation," Wang said.

Wang, a former Beijing mayor who recently took charge of China's financial sector, also called for tighter controls on flows of capital across borders -reflecting Beijing's concern over so-called "hot money" or speculative investments.

The government has long pointed to excessive investment in "fixed assets" such as property development and factory equipment as a strain on the economy that could trigger a financial crisis.

But surging consumer prices, driven largely by rising food costs, have drawn even greater concern given the worry among the communist leadership over the potential for soaring prices to trigger unrest among consumers.

Investors reacted swiftly to Friday's news. The benchmark Shanghai Composite Index opened higher but fell back after the producer price index was reported. By early afternoon, it had fallen 2.1 percent to 3,579.8.

Energy prices were a major factor behind April's 8.1 percent surge in the producer price index over the same month a year earlier, up from an 8.0 percent rise in March, the National Bureau of Statistics reported.

Prices for raw materials, fuel and power rose 11.8 percent. Crude oil registered the largest gain, surging 37.9 percent from a year ago. Raw coal was 20.9 percent more costly, while steel prices jumped 25 percent to 41 percent, the bureau said.