German investigation of U.S. espionage widens

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]