Reports that the United States was negotiating a 10-year nuclear deal with Iran are not true, White House spokesman Josh Earnest said on Tuesday.

AP claims that the deal would initially freeze Iran’s nuclear program but gradually allow it to increase activities that could enable it to produce nuclear arms in the last years of the agreement, which is expected to last some 10 years.

Iran insist that its program are civilian.

Reflecting the technical nature of the latest talks, US Energy Secretary Ernest Moniz and Iranian atomic nuclear chief Ali Akbar Salehi took part. Helga Schmid, political director of the European Union’s External Action Service, also attended.

Deputy Foreign Minister for Legal and International Affairs Abbas Araqchi left Vienna for Tehran on Tuesday after his meeting with IAEA Director-General Yukiya Amano.

After four days of intensive nuclear talks in Geneva, Araqchi conferred on Tuesday with IAEA Director General Yukiya Amano on cooperation and the need to speed up process of transparency of the Iranian nuclear program.

The Iranian top negotiator described nuclear talks as very good and constructive and said cooperation between the two sides will go ahead.