A meeting of European, Russian, Chinese and U.S. officials in London on Monday did not produce a full consensus on how to proceed with Iran over its nuclear programme, a senior German diplomat said on Tuesday. German Deputy Foreign Minister Gernot Erler, speaking on German public television, confirmed that agreement had been reached to convene an extraordinary meeting of the International Atomic Energy Agency (IAEA) in Vienna on Feb. 2. But he said there were still disagreements among the countries that met in London over the content of a planned resolution referring Iran to the U.N. Security Council and what the goal of such a resolution should be. "We remain in talks about what should be decided there and what the role of the United Nations should be," Erler said. "That is a sign that we could not reach a full agreement what the goal of the IAEA is through a resolution but that more time is needed." Erler added that it remained important to seek a diplomatic solution to the impasse over Iran's nuclear programme. "We remain of the opinion that there definitely must be a diplomatic solution," Erler was quoted as saying by Reuters."Western states and the Europeans are ready at any time to restart talks, but only if Iran fulfils the pledges it has made."