The French President has said that wire tapping allies is unacceptable after reports that the US National Security Agency (NSA) had spied on European partners with Denmark's assistance.

Emmanuel Macron said France and Germany were seeking full clarity on what happened.

"This is not acceptable amongst allies, and even less between allies and European partners," he told a news conference after a virtual meeting with German Chancellor Angela Merkel.

"I am attached to the bond of trust that unites Europeans and Americans," Mr Macron said, adding that "there is no room for suspicion between us."

"That is why what we are waiting for complete clarity. We requested that our Danish and American partners provide all the information on these revelations and on these past facts. We are awaiting these answers," he said.

Ms Merkel said she "could only agree" with the comments of the French leader.

In an investigative report published yesterday, Danish public broadcaster Danmarks Radio (DR) and other European media outlets said the NSA had eavesdropped on Danish underwater internet cables from 2012 to 2014 to spy on top politicians in Germany, Sweden, Norway and France.

The NSA was able to access text messages, telephone calls and internet traffic including searches, chats and messaging services - including those of Ms Merkel, then-foreign minister Frank-Walter Steinmeier and then-opposition leader Peer Steinbruck, DR said.

The findings are the result of a 2015 internal investigation in the Danish Defence Intelligence Service into NSA's role in the partnership, DR added, citing nine unnamed sources with access to the investigation.

Ms Merkel said at the summit that she was "reassured" by statements by the Danish government, especially Defence Minister Trine Bramsen, condemning such actions.

"Apart from establishing the facts, this is a good starting point to arrive at relations that are truly based in mutual trust," she said.