Operation Carthage, on 21 March 1945, was a British World War II air raid on Copenhagen, Denmark, which incurred significant collateral damage. The target of the raid was the Shellhus, used as Gestapo headquarters in the city centre. It was used for the storage of dossiers and the torture of Danish citizens during interrogations. The Danish Resistance had long asked the British to conduct a raid against this site. As a result, the building was destroyed, 18 prisoners were freed, and anti-resistance Nazi activities were disrupted. But, part of the raid was mistakenly directed against a nearby boarding school; it resulted in a total of 125 civilian deaths (including 86 schoolchildren and 18 adults at the school).