On 21 September 2001, an explosion occurred in the AZF fertiliser factory in Toulouse, France, belonging to the
Grande Paroisse branch of the
Total group. Three hundred tonnes of
ammonium nitrate were stored in hangar #221 (the maximum capacity was 2,000 tonnes). The whole factory was destroyed, leaving a crater with a depth of about 7 m (23 ft) and a diameter of 40 m (131 ft); steel girders were found 3 km away from the explosion. The blast measured 3.4 on the
Richter scale, with an estimated power equivalent to 20-40 tons of TNT. Two thirds of the city's windows were shattered, causing 70 eye wounds. The complete environmental consequences of the catastrophe are not yet fully known. The total damages paid by insurance groups currently exceed 1.5 billion euros. ==Investigation==