South Korean police have raided the Seoul headquarters of Starbucks Korea and searched the homes of company executives in connection with a marketing campaign widely condemned for trivialising the country's pro-democracy movement. The chain sparked public fury by branding stainless-steel tumblers "SS Tank" and designating 18 May — the anniversary of the 1980 Gwangju uprising (a pivotal moment in which South Korea's military-backed government killed around 200 pro-democracy demonstrators) — as "Tank Day". The campaign also used a slogan associated with the cover-up of a student activist's death by torture in 1987, prompting parent company Shinsegae Group to scrap the promotion, fire the chief executive, and close all Korean stores for a mandatory history training day; police launched their formal investigation following complaints from victims' relatives.