Germany's top federal prosecutor is investigating allegations that the U.S. National Security Agency tapped Chancellor Angela Merkel's cellphone. The inquiry won't focus on wide spying activities attributed to the agency, which allegedly included snooping on data connections and companies in Germany.

As newspaper Deutsche Welle reports, the public announcement is a reversal from last week, when it seemed the prosecutor wouldn't pursue the case.

From Berlin, NPR's Soraya Sarhaddi Nelson reports for our Newscast unit:

"Chief federal prosecutor Harald Range has been under increasing public pressure to investigate NSA surveillance in Germany. But the formal probe he announced to the German Parliament today will be limited to the bugging of Merkel's cellphone."The chancellor has repeatedly demanded an explanation from Washington about the alleged tapping of her phone, but never received one."That allegation, along with revelations of U.S. agents conducting widespread phone and Internet surveillance of Germans, has strained relations between Washington and Berlin."The NSA is also accused of tapping the phone of Merkel's predecessor, Gerhard Schroeder, after he spoke against then-President Bush's calls for war in Iraq."

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