Helmets of Tanzanian UN peace keepers who were killed by suspected Ugandan rebels are displayed during a tribute ceremony in Goma, on December 15, 2017. Tanzania called for an investigation into the killing of 14 soldiers serving as UN peacekeepers in Democratic Republic of Congo by suspected Ugandan rebels. Tanzanian army chief General Venance Mabeyo said one soldier was still missing and 44 wounded troops were being treated in hospital. / AFP PHOTO / STR (Photo credit should read STR/AFP/Getty Images)
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