During a mandatory test on board 🇩🇰HDMS Niels Juel (alongside in Naval Station Korsør) (Denmark), a Harpoon missile booster activated and cannot currently be deactivated. There is a risk the missile may launch and air and sea space around the area has been closed. Danes have form for this - in 1982 an older variant of Harpoon was accidentally launched from the frigate HDMS Peder Skram. It flew 21km, destroyed 4 cottages and damaged 130 other buildings fortunately with no loss of life.