Deutsche Telekom said it had found no indication that the U.S. National Security Agency (NSA) and Britain's GCHQ had obtained access to its computer network, but said it was investigating the matter following a report in Sunday's Der Spiegel magazine.
"We are looking into every indication of possible manipulations but have not yet found any hint of that in our investigations so far," a Telekom spokesman said in a statement on Sunday. "We're working closely with IT specialists and have also contacted German security authorities.