Despite concern over rising currencies in the region, the Monetary Authority of Singapore (MAS) highlighted inflation as its main concern, pushing the city-state's unit to as high as 1.2886 against the US dollar.

The move contributed to further US dollar weakness in Asian trade with the euro briefly rising to 1.41 dollars for the first time in nine months.

A stronger Singapore dollar will lower the cost of imports for the city-state, which buys most of its needs from abroad.

The Ministry of Trade and Industry said the economy expanded an annual 10.3 percent in the third quarter.

While slower than the second quarter's 19.6 expansion, the July-September data showed Singapore was on track to achieve blistering growth projections after last year's 1.3 percent contraction caused by the global downturn.

Singapore shares closed 7.14 points, or 0.22 percent, lower at 3,195.02.

The MAS said that while gross domestic product growth was slowing to a "more sustainable pace", domestic cost pressures were rising due to the "high level of resource utilisation" and tight labour market in particular.

"Thus, the balance of risks is weighted towards inflation going forward," the central bank added.

The central bank projects underlying inflation, which excludes accommodation cost and private transport, to average 2.0 percent this year and 2.0-3.0 percent in 2011.

The last time inflation became a major concern was in 2008 when it hit 6.5 percent, the highest in nearly three decades, before the global slowdown.

Singapore's monetary policy is conducted via the local dollar, which is traded against a basket of currencies of its major trading partners within an undisclosed band.

The MAS said "the slope of the policy band will be increased slightly" -- a signal that essentially means authorities will allow the Singapore dollar to continue to appreciate.

"We believe it is concerns about inflation that have prompted MAS to increase the slope of the policy band," said analysts from Barclays Capital, the investment banking division of Barclays Bank.

DBS Bank said in a market commentary that the MAS "surprised the market yet again" with its policy statement.

"Indeed, the focus is on inflation in the coming months as external inflationary pressure is expected to pick up on higher commodity prices," the statement added.

DBS said it was maintaining its 2010 growth forecast of 15 percent GDP growth for the city-state, adding that the slowdown in the second half was "much in line with the normalisation process in Asia".

The trade and industry ministry said the decline in growth momentum in the third quarter was "an expected correction from the exceptional growth in the first half of the year".

"Growth in the rest of the year will be underpinned by a number of industry-specific factors.

"In particular, continued growth in global demand for electronic products will lend some support to the electronics and precision engineering clusters," the ministry added.

During the third quarter, the manufacturing sector grew 12.1 percent from a year ago, substantially slower than the 46.1 percent surge in the previous quarter, the ministry said.

The slower momentum came largely from the biomedical industry, particularly pharmaceuticals.