Inquiries continue into unusual financial activity before the attacks on America on September nth. Trades under suspicion include the use of derivatives and the short-selling of shares in airlines, insurance companies and stock indices. Without hard evidence, regulators are wary about concluding that the markets were manipulated, although European financial leaders, including Ernst Welteke, president of Germany's Bundesbank, have referred publicly to signs of suspicious market movements. The last thing anybody wants is wrongly to credit the conspirators with financial-engineering skills.
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