On 18 July 1806, approximately 40,000 lb (18,000 kg) of gunpowder stored in a magazine (polverista) in Birgu, Malta, accidentally detonated. The explosion killed approximately 200 people, including British and Maltese military personnel, and Maltese civilians from Birgu. Parts of the city's fortifications, some naval stores, and many houses were destroyed. The accident was found to be the result of negligence while transferring shells from the magazine.