Representatives of six world powers are intensifying efforts in talks with Iran on its nuclear programme, ahead of a 31 March deadline for a deal. BBC was there:
The US secretary of state and German and French foreign ministers have all cancelled their travel plans in a final push for an agreement. Representatives from China, Russia and the UK are also at the negotiations. US officials say all parties have agreed to a “step by step approach” to the deal, but sticking points remain.
The world powers, known as the P5+1 group – the five permanent members of the UN Security Council plus Germany – want to ensure that Iran cannot develop nuclear weapons.
Iran denies it is aiming to build nuclear weapons and is hoping that a deal will lead to the lifting of international sanctions. Sunday’s talks will take place in the Swiss city of Lausanne, with world powers meeting Iranian Foreign Minister Mohammad Javad Zarif.
US officials said all parties, including Iran, had agreed “there needs to be a phased step by step reciprocal approach”, so that Iran’s steps to scale back its nuclear programme are met with a phased lifting of sanctions.