Critical peace talks between the Taliban and the Afghan government in Qatar have been postponed after a disagreement over who should attend. Sultan Barakat, director of Qatar's Center for Conflict and Humanitarian Studies, the organisation sponsoring the talks, tweeted news of the postponement, saying "this is unfortunately necessary to further build consensus as to who should participate in the conference". The talks, scheduled for Friday between Afghan government and Taliban representatives, were considered a significant first step towards finding a negotiated end to the war in Afghanistan and the eventual withdrawal of US troops, which would end the US's longest war. A list of 243 people was announced by Qatar on Thursday. That list differed from Afghan President Ashraf Ghani's list of 250 people, which included around 50 women, according to a senior government official, who spoke on condition of anonymity.