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The U.N. has operated in the Democratic Republic of the Congo for years. Thursday evening's attack was the bloodiest assault on peacekeeping forces in recent memory, according to a U.N. official. Giles Clarke/Getty Images hide caption

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Giles Clarke/Getty Images

A Yemeni man receives treatment at a hospital after a Saudi-led coalition airstrike in Taez, Yemen, on Tuesday. Ahmad al-Basha/AFP/Getty Images hide caption

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Ahmad al-Basha/AFP/Getty Images

United Nations special envoy to Syria Staffan de Mistura is seen on a video screen as he listens to a Security council meeting on Syria at U.N. headquarters in June about the possible use of sarin gas in an attack that killed more than 90 people. Mary Altaffer/AP hide caption

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Mary Altaffer/AP

Mission San Jose, one of five missions in San Antonio designated by UNESCO as a World Heritage Site. The cultural aid agency has designated more than 1,000 such sites around the world — including more than 20 in the U.S. — to celebrate their "outstanding universal value." Eric Gay/AP hide caption

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Eric Gay/AP

TV screens at a store in Seoul, South Korea, show news coverage of the latest exchange of insults between President Trump and North Korean leader Kim Jong Un. Ahn Young-joon/AP hide caption

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Ahn Young-joon/AP

President Trump applauded the U.N. Security Council for its recent votes to impose tough economic sanctions on North Korea, during an address to the U.N. General Assembly on Tuesday. Jewel Samad/AFP/Getty Images hide caption

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Jewel Samad/AFP/Getty Images

President Trump and U.N. Secretary-General Antonio Guterres shake hands during a meeting at U.N. headquarters in New York on Monday. Trump will address the General Assembly on Tuesday. Brendan Smialowski/AFP/Getty Images hide caption

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Brendan Smialowski/AFP/Getty Images

They're the only two female artists working on a Mongolian street mural about the U.N. Sustainable Development Goals: Michid Enkhbat (stooping) and Odno Bold. The goal they're illustrating: "gender equality." Katya Cengel for NPR hide caption

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Katya Cengel for NPR

Members of Myanmar's ethnic Rohingya minority trek through rice fields after crossing the border into Bangladesh on Friday. Myanmar's military says nearly 400 people have died in violence in the western state of Rakhine. Bernat Armangue/AP hide caption

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Bernat Armangue/AP

Wind turbines provide energy in Egypt's Sinai Desert. Helping developing countries harness energy from the wind is one of the Green Climate Fund's goals. Anton Petrus/Getty Images hide caption

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Anton Petrus/Getty Images

Michael Sharp visited Elizabeth Namavu and children in Mubimbi Camp, home to displaced persons in the Democratic Republic of Congo, during his time in the country. When he was killed, he was part of a U.N. mission. Jana Asenbrennerova/Courtesy of MCC hide caption

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Jana Asenbrennerova/Courtesy of MCC