South Korea grounded its old AH-1S Cobra military helicopters on Monday after a tragic crash. The helicopter was training for emergency landings in Gapyeong county, west of Seoul, when it crashed for an unknown reason. Two service members were hurt and taken to hospital but later died. The army confirmed the crash happened during a training exercise and said it was caused by an unidentified cause. The accident has led to the temporary grounding of the entire AH-1S Cobra fleet for safety checks.