Talks aimed at curbing Iran’s nuclear activity look set to run beyond Tuesday’s deadline for a deal. <br /><br /> Iran and the UN’s permanent five members plus Germany (P5+1) are involved in the negotiations, which are taking place in Vienna.<br /><br /> The aim is to agree limits on Tehran’s nuclear programme in return for international sanctions being relaxed.<br /><br /> How much access Tehran is prepared to grant to nuclear monitors is believed to be the stumbling block.<br /><br /> Iran’s Foreign Minister is flying back to Tehran from Vienna to consult directly with his government.
