Germany is investigating a suspected U.S. spy in its military, a security source said, days after the arrest of a member of its foreign intelligence agency as a double agent tested U.S. relations already strained by espionage.
The Federal Prosecutor's office said in a statement that authorities had begun conducting searches in Berlin on Wednesday morning in connection with a suspected spy, who had not been arrested. It gave no further details.
"The suspect is from the military," a security source told Reuters, speaking on condition of anonymity.
The new investigation comes just days after Germany arrested a 31-year-old employee of the BND foreign intelligence service who admits passing documents to a U.S. contact. The foreign ministry has called in the U.S. ambassador for an explanation.
German Chancellor Angela Merkel said on Monday that if it proved to be true that the BND officer was spying for NATO ally the United States, it would be a "serious case".