United Nations General Assembly meeting at UN Headquarters. ©Mark Henley/Panos Pictures


Diplomats in discussion at the end of the last session of the week-long Third Meeting of the Treaty on the Prohibition of Nuclear Weapons. UN headquarters in New York. ©Mark Henley/Panos Pictures


Diplomat from Sierre Leone surrounded by translators papers, during the Third Meeting of the Treaty Prohibiting Nuclear Weapons. ©Mark Henley/Panos Pictures


United Nations staff member, tidying up and replenishing desks of members of the UN Security Council at UN Headquarters following a meeting. Meetings can in theory be called at short notice at any time. ©Mark Henley/Panos Pictures


Syrian diplomat with assistants behind, representing the new regime, addressing a meeting of the United Nations Security Council at UN headquarters in New York. Dealing with the post revolution Syria and all its complex problems is one of the rare examples today of the Security Council working together, as here during an update on the weapons situation in the country. ©Mark Henley/Panos Pictures


Simultaneous translators at work during a meeting of the United Nations Security Council at UN headquarters in New York. ©Mark Henley/Panos Pictures


United States Diplomat speaking during a meeting of the United Nations General Assembly, at UN Headquarters calling for a formal vote on establishing an International Day for Judicial Well-being so that his government could register its negative vote. It passed by 160 in favour, and a single vote in opposition from the US. ©Mark Henley/Panos Pictures


Representative of Algeria, a non permanent rotating member of the UN Security Council, in discussion with an assistant while attending a meeting of the council at United Nations Headquarters in New York. ©Mark Henley/Panos Pictures


A woman stops to look at a portrait of Kofi Annan, amongst the line of paintings of former Director Generals lining the ground floor of the Secretariat Building of UN Headquarters. To the right is Ban Ki-moon. ©Mark Henley/Panos Pictures


UN Secretary General Antonio Guterres with members of his entourage behind, giving an address in the General Assembly Hall at United Nations Headquarters. ©Mark Henley/Panos Pictures


United Nations administrative staff at work during a meeting of the United Nations Security Council at UN headquarters in New York. ©Mark Henley/Panos Pictures


Private discussions between Japanese and German mayors and the president of the Third Meeting of the Treaty on the Prohibition of Nuclear Weapons, at the United Nations Headquarters in New York, in a lounge facing the East River. ©Mark Henley/Panos Pictures


Norwegian People’s Aid, & Nuclear Weapons Ban Monitor representative of ‘Civil Society’ addressing a plenary session of the week-long Third Meeting of the Treaty on the Prohibition of Nuclear Weapons at the United Nations Headquarters in New York. The TPNY is a rare exception at the UN with the central role given to Civil Society - unfortunately it is boycotted by all nuclear states. ©Mark Henley/Panos Pictures


United Nations lift operator, in a suit belonging to the UN, wearing a map of the world tie. ©Mark Henley/Panos Pictures


UN functionary on the phone while walking a corridor at UN headquarters at the end of the day ©Mark Henley/Panos Pictures


Science advisory group member addressing the week-long Third meeting of Treaty on the Prohibition of Nuclear Weapons. ©Mark Henley/Panos Pictures


UN Secretary General Antonio Guterres and entourage walking a UN corridor on a Friday evening, as the building empties. ©Mark Henley/Panos Pictures


Russian representative in discussion before a meeting of the United Nations Security Council at UN headquarters in New York, which will include the armament situation in Syria, with representations by the new Syrian government. ©Mark Henley/Panos Pictures


Swiss diplomat addressing the General Assembly at United Nations Headquarters, seen from a translator’s booth. ©Mark Henley/Panos Pictures


Discussion between diplomat and functionaries during a meeting of the United Nations General Assembly, at UN Headquarters. ©Mark Henley/Panos Pictures


Dusk falls, along with the rain, over the the East River as people leave conferences, at the end of the day, at the East United Nations Headquarters. ©Mark Henley/Panos Picture


Vatican representative addressing a plenary session during the week-long Third meeting of the Treaty on the Prohibition of Nuclear Weapons, at the United Nations Headquarters in New York. The nuclear powers are completely absent - but the 5 major players actually regularly meet in the next door chamber, the UN Security Council. So close yet so far away. ©Mark Henley/Panos Pictures


Russian representative at a meeting of the United Nations Security Council at UN headquarters in New York. ©Mark Henley/Panos Pictures


Copy of the Treaty on the Prohibition of Nuclear Weapons, in the hand of a campaigner after a plenary session of the week-long Third Meeting of the Treaty on the Prohibition of Nuclear Weapons at the United Nations Headquarters in New York. The TPNW was created in 2017, despite the nuclear powers, and has now been signed by almost half of the UN member states, it is unusual in the prominent role given to civil society, and quite apart from a symbolic existence, it funds crucial scientific research into nuclear issues, and gives a platform to victims of the nuclear weapons industry. ©Mark Henley/Panos Pictures


Packed side event at the United Nations, on the history and lessons learnt from the Hibakusha movement in Japan. The Hibakusha are victims of the nuclear bombing of Japan. Taking place during the week-long Third Meeting of Treaty on the Prohibition of Nuclear Weapons, now signed by almost half the world’s states. The TPNW was created in 2017, despite the nuclear powers, and has now been signed by almost half of the UN member states, it is unusual in the prominent role given to civil society, and quite apart from a symbolic existence, it funds crucial scientific research into nuclear issues, and gives a platform to victims of the nuclear weapons industry. ©Mark Henley/Panos Pictures


American demonstrators arrested by NYPD during a rally calling for the banning of nuclear weapons, outside the UN, during the week-long Third Meeting of the Treaty on the Prohibition of Nuclear Weapons at the United Nations Headquarters in New York. ©Mark Henley/Panos Pictures


A meeting of the United Nations Security Council at UN headquarters in New York, with discussions concentrating on the armament situation in Syria, with representations by the new Syrian government, seated at far left. ©Mark Henley/Panos Pictures


Participant during an emotional side event organised by ICAN (the International Campaign to Ban Nuclear Weapons) to launch a report on the impact of nuclear weapons on children during the week-long Third Meeting of the Treaty on the Prohibition of Nuclear Weapons at the United Nations Headquarters in New York. ©Mark Henley/Panos Pictures


Anti-war demonstrator on Times Square outside US army recruiting office decorated with Stars and Stripes and displaying videos of soldiers in action. ©Mark Henley


Fox News broadcast of President Trump address the United Nations General Assembly. ©Mark Henley/Panos Pictures


Closed off escalator at United Nations Headquarters. ©Mark Henley/Panos Pictures