Those who died were honored by delegates with a moment of silence as the U.N. Environment Assembly kicked off Monday morning.
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Among the U.N. personnel killed in the crash are seven representatives of its World Food Programme and six staff members from the U.N. office in Nairobi.
"This has taken us by shock,” said Siddharth Chatterjee, the U.N. resident coordinator in Nairobi. “Every person that lost his or her life has a loved one left behind who will be mourning this loss forever."
Authorities confirmed that the plane was carrying passengers from more than 30 countries. They included 18 Canadians; eight apiece from China, the United States and Italy; and seven each from France and Britain.
The International Organization for Migration, a related organization to the U.N., said Sunday that staff member Anne-Katrin Feigl, was among the victims. The German national was based in Sudan and en route to a training course in Nairobi.
Catherine Northing, chief of the IOM mission in Sudan, called Feigl “an extremely valued colleague."
"The staff are in a state of shock," Northing said. "One colleague said today, 'she was always bringing happiness to us.' Her tragic passing has left a big hole and we will all miss her greatly."
I express my sincere condolences to the families and friends of those who lost their lives in the #ET302 plane crash. Two @ITU staff members from @ITUROAfrica were on the flight. Our colleagues in Addis are providing support to their families during this difficult time
All of us at UNICEF mourn the tragic loss of our UN colleagues and all those who died in the Ethiopian Airlines crash today. May they rest in peace. Our thoughts are with their families and loved ones.
David Beasley, the executive director of the World Food Programme, tweeted: "As we mourn, let us reflect that each of these WFP colleagues were willing to travel and work far from their homes and loved ones to help make the world a better place to live. That was their calling, as it is for the rest of the WFP family."
High Commissioner for Refugees Filippo Grandi said the U.N. refugee agency had suffered a "huge loss." Two UNHCR workers were killed in the crash.
Yuliya Talmazan is a London-based journalist.
Caroline Radnofsky, Associated Press and Reuters contributed.