The British ambassador, Dominick Chilcott, has been evacuated to Britain. "Iran is not the sort of country where spontaneously a demonstration congregates then attacks a foreign embassy," he said. "That sort of activity is only done with the acquiescence and support of the state," US Vice President Joe Biden has been in Ankara, Turkey, as part of an attempt to rally international opposition to Iran's nuclear ambitions. He said: "However, we also believe that putting pressure on Iran's leadership is necessary to secure a negotiated settlement, and that is why we encourage our partners, including Turkey, to take steps to impose new sanctions on Iran, as we have continued to do."