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Ban carried a torch Thursday morning as he ran alongside Sarajevo's marathon runner Islam Djugum, who even during Bosnia's 1992-95 war trained daily but only after dark to avoid snipers.
Ban said he will carry Sarajevo's spirit of resilience and reconciliation to London because here he saw a city that has risen from ashes and ruins and is now pulsing with "real life".
Ban will later visit Srebrenica, the site of the worst massacre in Europe since World War II, where 8,000 men and boys were killed by Serb forces.