Secret parameters would be included in any agreement over the future of Iran’s nuclear programme, say diplomats, as Lausanne summit enters eighth day.

Foreign ministers at talks in Lausanne on Iran’s nuclear programme have said they are inching towards a joint statement, which would be accompanied by a set of agreed parameters that would be kept secret, according to European diplomats.

After an all-night negotiating session, the ministers continued to make slow progress towards a consensus, but diplomats said there were still a small number of issues to be resolved before a joint statement could be made.

The negotiations in Lausanne have entered their eighth day and are two days beyond a deadline for arriving at a framework accord, which was supposed to be a preliminary step before a comprehensive and detailed agreement at the end of June.

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