"We swiftly sent a request to our American partners asking for an immediate and comprehensive clarification," the spokesman Steffen Seibert said in a statement.
He added that Merkel had made clear to Obama that if the information proved trued it would be "completely unacceptable" and represent a "grave breach of trust".
Also Read
President Barack Obama on Wednesday sought to assure German Chancellor Angela Merkel that the United States is not monitoring her communications after Merkel raised the issue with Obama. White House spokesman Jay Carney said Obama and Merkel spoke on the phone about German fears that the US National Security Agency had been spying on her. Carney, asked about the allegation that the NSA had monitored her cell phone conversations, said Obama assured Merkel that "the United States is not monitoring the communications of the chancellor."
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