German investigation of U.S. espionage widens
Jul 09, 2014, 6:37 PM EDT

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German authorities carried out raids in Berlin on Wednesday as part of an espionage investigation that placed new strain on U.S.-German relations and raised concern in the Obama administration of a broader crackdown on U.S. spying.
Background:
German investigation of U.S. espionage widens [WaPo]
Anger mounts as Germany unearths second U.S. spy suspect [Reuters]