Forty workers die in an explosion at the Lapua ammunition factory, the deadliest accidental disaster in modern history in Finland.

The Lapua Cartridge Factory explosion (Finnish: Lapuan patruunatehtaan räjähdys) was an industrial disaster in an ammunition factory in Lapua, Finland on 13 April 1976. Forty workers were killed and 60 people injured. This was Finland's worst industrial disaster.