Five people were shot dead in the Swiss town of Würenlingen on 9 and 10 May 2015. One of the dead was the attacker, a Swiss national. It is believed that the reason for the attack was a family dispute. The offender killed his parents-in-law, his brother-in-law, a neighbour, and then himself. He was known to the police for various offenses. His wife and his three children lived apart from him in a secret welfare house. The misused gun was not registered and was not from army stocks. Even in a recent house search at the residence of the offender in the canton of Schwyz, no gun had been found.