More information is needed for an open discussion on the most important issues of the Transatlantic Trade and Investment Partnership (TTIP), which has only been discussed behind closed doors, said Petter Slaatrem Titland, activist and chair at Attac, Norway.

A leaked exchange of testy e-mails between US and EU officials shows signs of growing disagreements, with the two sides locked in secretive negotiations over a free trade deal known as TTIP (Transatlantic Trade and Investment Partnership).