What is the fine-grained topic of the following text: The conference was also attended by the Afghan president Hamid Karzai, the Afghan Minister of Foreign Affairs, the US secretary of state Hillary Clinton, UN Secretary General Ban Ki-Moon, UN envoy Kai Eide and the British Secretary of State David Miliband, as well as the former Afghan minister of finance Ashraf Ghani and former British prime minister Gordon Brown. Only return the topic.
Afghan conference attendance by international political figures