Geneva - A Swiss man killed three in-laws and a neighbour in a town near Zurich before turning his gun on himself, police said Sunday, sending shockwaves through the normally tranquil nation.
Local police swiftly ruled out a terrorist attack, characterising the incident as a "tragic relational drama".
The drama was played out on Saturday evening in the town of Wuerenlingen, near Zurich, was among the dead, local police spokesman Michael Leutpold told a news conference.
All the victims and the gunman were Swiss.
Police said the attacker was 36-year-old but did not reveal his identity. He was a father of three but no longer living with his family.
He did not have a gun licence and did not fire with a military weapon, the police spokesman said.
The gunman first went to a house in a residential area and fired on three people, killing a 58-year-old man, his 57-year-old wife and a 32-year-old man. The older couple were his parents-in-law and the younger man his brother-in-law, police said.
He then went to another house and shot dead a 46-year-old male neighbour, before turning the gun on himself.
AFP