Catherine Samba-Panza, interim president of the Central African Republic, addresses a plenary meeting of the United Nations Sustainable Development Summit 2015 at the United Nations headquarters in Manhattan, New York September 26th, 2015. Photograph: Darren Ornitz/Reuters

Fierce fighting between militia and UN peacekeepers erupted in Central African Republic on Tuesday as President Catherine Samba-Panza rushed back earl(...)

A soldier looks at smoke billowing from the site of a Saudi-led air strike on a Houthi position in the Yemeni frontline province of Marib on September 15th, 2015. Photograph:  REUTERS/Stringer

If displaced people had a country of their own it would be bigger than Spain. The numbers – 50 million and rising – are set to grow, soon and signific(...)

Bentiu, South Sudan. Photograph: Colm Moloney

The day is written into my mind in indelible ink. The biggest, whitest, fluffiest clouds raced across the bluest sky I had ever seen. I was in Zimbabw(...)

UN secretary-general Ban Ki-moon: “Ultimate responsibility rests with governments who send their people.” Photograph: Jonathan Ernst/Reuters

The head of the United Nations peacekeeping mission in Central African Republic has resigned after a fresh round of allegations of sexual abuse and ex(...)

US president Barack Obama with African Union chairperson Nkosazana Dlamini Zuma (right) arrives to speak about security and economic issues and US-Africa relations at the African Union headquarters in Addis Ababa on Tuesday. Photograph: Saul Loeb/AFP/Getty Images

Barack Obama has made a scathing attack on Africa’s culture of presidents-for-life, urging the continent’s leaders to follow the example of George W(...)

 An explosion during a  Nato military exercise in Drawsko Pomorskie military range in  Poland. A global security report said on Wednesday that the cost of violence around the world reached a record $14.3 trillion last year. Photograph: Marcin Bielecki/EPA.

The cost of violence around the world reached a record $14.3 trillion (€12.7 trillion) in 2014, equivalent to the combined economies of Brazil, Can(...)

 UN Secretary-General Ban Ki-moon has announced a review of how the body dealt with claims of child sexual abuse by soldiers from France, Chad and Equatorial Guinea in the Central African Republic. File photograph: Mandel Ngan/AFP/Getty Images

United Nations Secretary-General Ban Ki-moon announced on Wednesday that he would set up an external independent review of how the world body handled (...)

Voters from an Internally Displaced People camp in Maiduguri queue to get registered for Nigeria’s presidential elections. Conflicts and violence in places like Syria and Ukraine have displaced a record 38 million people inside their own countries, equivalent to the total populations of New York, London and Beijing, according to the Norwegian Refugee Council. Photograph: Stringer/AFP Photo/Getty Images

The number of people displaced within their own countries was the worst in a generation last year, but there is little sign of governments taking acti(...)

French president Francois Hollande: said would “make an example” of up to 16 French soldiers if allegations contained in a United Nations report leaked to a newspaper prove true

President François Hollande has said he would “show no mercy” and would “make an example” of up to 16 French soldiers accused of sexually abusing chi(...)

US president Barack Obama delivers a statpment in  White House in  on Thursday in which he apologised for a counterterrorism operation in January that accidentally killed two aid workers held hostage by al Qaeda. Photograph: Jonathan Ernst/Reuters

US president Barack Obama expressed his “deepest apologies” on behalf of his government over the killing of two aid workers, an American and an Itali(...)