The crash occurred during a routine training exercise in the Brcko region, 180 kilometres north of Sarajevo, where EUFOR maintains a peacekeeping presence of up to 1,500 troops.
A Boeing CH‑47 Chinook, carrying 15 crew and support staff, nosed down and burst into flames. Four men were killed on impact; the remaining 11 suffered injuries ranging from minor burns to traumatic fractures.
Two of the fatalities were Italian soldiers from the 6th Regiment, while the other two were Red Cross volunteers from the International Committee of the Red Cross, the Italian Defence Ministry confirmed.
Brcko hospital treated the injured, with three severe cases earmarked for transfer to Tuzla's General Hospital. The fourth victim later succumbed to injuries in Brcko.
Defence Minister Guido Crosetto expressed condolences, urging families. EUFOR said it will conduct a full and thorough investigation, with preliminary findings expected within weeks.