BERLIN (AP) - Germany's top security official says Internet users worried about their data being intercepted by US intelligence agencies should stop using American websites such as Google and Facebook.

Leaked revelations about the US National Security Agency's wholesale information on foreign web users has prompted outrage in Europe and calls for tighter international rules on data protection.

Interior Minister Hans-Peter Friedrich told reporters in Berlin on Wednesday that "whoever fears their communication is being intercepted in any way should use services that don't go through American servers". Dr Friedrich says German officials are in touch with their US counterparts "on all levels" and a delegation is scheduled to fly to Washington next week to discuss the claims that ordinary citizens and even European diplomats were being spied upon.