For days Iran, the United States, Britain, France, Germany, Russia and China have been holding negotiations to break an impasse in negotiations aimed at stopping Tehran having the capacity to develop a nuclear bomb in exchange for an easing of international sanctions that are crippling its economy.
 
But officials at the talks in the Swiss city of Lausanne cautioned that attempts to reach a framework accord could yet fall apart.

German Foreign Minister Frank-Walter Steinmeier said there had been "some progress and some setbacks in the last hours".

"I can't rule out that there will be further crises in these negotiations," he added.

In addition to U.S. Secretary of State John Kerry, Iranian Foreign Minister Mohammad Javad Zarif and Steinmeier, British Foreign Secretary Philip Hammond, French Foreign Minister Laurent Fabius, Russia's Sergei Lavrov and China's Wang Yi gathered at a 19th-century hotel overlooking Lake Geneva to try to end the deadlock in the talks.

The ministers met for an hour and then broke of their discussions. They were expected to meet again later on Monday.

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