Lapua is also home to a large ammunition factory, which commenced operations in 1927 as the "State Cartridge Factory". This factory was the primary supplier of ammunition to the Finnish Army during the Winter War and World War II. An explosion occurred in a warehouse of this factory on 13 April 1976, resulting in the deaths of 40 employees, mainly women. Sixty children lost a parent in the disaster. This is the worst accidental disaster in Finland's modern history. After the explosion, the factory was relocated away from the town centre and continues production today as part of the Nordic Ammunition Group (Nammo) as Nammo Lapua. The original site of the factory and the surviving buildings are now an arts centre, a library and a theater.