An employee of Germany’s intelligence agency has been arrested on suspicion of spying for the US, reports say.
The man is said to have been trying to gather details about a German parliamentary committee that is investigating claims of US espionage.
The US National Security Agency (NSA) was last year accused of bugging the phone of Chancellor Angela Merkel as part of a huge surveillance programme.
The NSA revelations put a strain on ties between Germany and the US.
US officials at the embassy in Berlin have declined to comment on the latest development.