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FRANKFURT—A top European Central Bank official said the ECB could make asset purchases if needed, as euro-zone policy makers increasingly float the prospect of deploying a tool that is commonly used by other major central banks but stirs deep divisions in Europe. The comments, by ECB Vice President Vitor Constâncio, are the latest in a string of assurances by top officials at the central bank that it still has an array of policy options in its arsenal, even after reducing interest rates to record lows earlier this month. Recent ECB references to the idea of asset purchases, known as quantitative easing, are "only as a possibility and nothing else. Everything is possible. That was what Peter Praet said," Mr. Constâncio told reporters on the sidelines of the 16th annual Euro Finance Week in Frankfurt."If our mandate is at risk we are going to take all the measures that we think we should take to fulfill that mandate," Mr. Praet, who also heads the ECB's powerful economics division, said in the interview last week. "The balance-sheet capacity of the central bank can also be used," he added. "This includes outright purchases that any central bank can do."The officials gave no indication that such a policy is under serious consideration now. Mr. Praet said in the interview that inflation risks are balanced after the ECB's rate cut, which brought its main policy rate to 0.25%. Mr. Constâncio on Tuesday said the ECB hasn't discussed how it would conduct quantitative easing technically. The euro largely shrugged off his comments.Still, simply raising the idea of quantitative easing marks a significant shift in rhetoric from the central bank. ECB President Mario Draghi sidestepped a question about the policy at his monthly news conference on Nov. 7, saying only that the ECB had "a whole range of instruments" that could be activated before hitting the floor on interest rates. It is "remarkable how the attitude of some ECB Governing Council members toward [quantitative easing] has changed," BNP Paribas BNP.FR +0.41%BNP Paribas S.A.France: Paris ^€54.01 +0.22+0.41% Nov. 20, 2013 10:29 am Volume : 575,621 P/E Ratio 12.83Market Cap€68.13 Billion Dividend Yield 2.78% Rev. per Employee €155,68211/13/13 BNP Paribas SA Buys Belgium's ...10/31/13 BNP Paribas's Interesting Lack...10/31/13 BNP Paribas Profit Rises Despi...More quote details and news »BNP.FR inYour ValueYour Change Short position economist Ken Wattret said in a research note. "What was once a taboo, then a last resort is now an option under consideration."