Berlin (AFP) - US President Barack Obama was personally informed of mobile phone tapping against German Chancellor Angela Merkel, which may have begun as early as 2002, German media reported Sunday.
Bild am Sonntag newspaper quoted US intelligence sources as saying that National Security Agency chief Keith Alexander had briefed Obama on the operation against Merkel in 2010.
"Obama did not halt the operation but rather let it continue," the newspaper quoted a high-ranking NSA official as saying.
Meanwhile newsweekly Der Spiegel reported ahead of its Monday issue that leaked NSA documents showed Merkel's phone had appeared on a list of spying targets since 2002, and was still under surveillance weeks before Obama visited Berlin in June.
The spying row has prompted European leaders to demand a new deal with Washington on intelligence gathering that would maintain an essential alliance while keeping the fight against terrorism on track.
Germany will send its own spy chiefs to the United States next week to demand answers following the allegations that US intelligence has been tapping Merkel's mobile phone, as the row threatened to fray transatlantic ties.
Merkel confronted Obama with the suspicion in a phone call on Wednesday saying that spying on allies would be a "breach of trust" between international partners.
