Finnish farmworker Karl Emil Malmelin kills seven people with an axe at the Simola croft in the village of Klaukkala.

Karl Emil Malmelin was a Finnish farmworker and mass murderer.

Klaukkala is the southern-most urban area of the Nurmijärvi municipality in Uusimaa, Finland, located near Lake Valkjärvi. It is the largest urban area in Nurmijärvi, and despite the fact that it officially has the status of a village, it is often mistakenly thought to be a separate town due to its size and structure. In the 2010s, Klaukkala's urban area grew to be part of the larger Helsinki urban area.

May 10 is the 130th day of the year in the Gregorian calendar; 235 days remain until the end of the year.