On Thursday 8 January 1998, a Czech Hip helicopter with 21 personnel on board crashed shortly after take off from Bos Krupa, northwest Bosnia. Seventeen casualties (including six with severe injuries) were airlifted from the scene for treatment at the British Hospital Squadron in Sipovo before aeromedical evacuation the next day to Prague, or discharge to their unit. This was the largest mass casualty incident dealt with by the British Defence Medical Services since British troops deployed to Bosnia in 1992.