MUNICH—Tensions between Huawei Technologies Co. and U.S. officials flared at a global security gathering Friday, a day after American prosecutors charged the company with racketeering and conspiracy to steal trade secrets.

John Suffolk, a Huawei senior vice president, dismissed the charges against the company as meritless, saying they were predominantly recycled from civil disputes over the past 20 years that had been litigated and settled.

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