Local police investigating the tragic mystery said the French family jumped one after another from their apartment in the Swiss city of Montreux. 

The family appeared to be ardent conspiracy theorists and hoarding food in their apartment, they added. The tragedy happened in the city on Lake Geneva last Thursday, the Mirror reports. Tributes next to the scene of a tragic collective family suicide (Image: AFP via Getty Images) Read more related articles Read more related articles Only a 15-year-old boy survived the tragedy. He is now in a coma in a stable condition in the hospital. Vaud district police said their findings “make it possible to rule out third party intervention and suggest that all the victims jumped from the balcony one after the other”. They are currently working on the theory of collective suicide, they said. A 40-year-old man, his 41-year-old wife, her twin sister and the couple’s eight-year-old daughter along with the boy, took their own lives. The French newspaper Journal du Dimanche reported that the father, Eric David, grew up in a rich part of Marseille and even attended one of the most famous schools in France, the Ecole Polytechnique. The twin sisters, Nasrine and Narjisse Feraoun, grew up in a family of five, all of whom were educated at the elite Lycee Henri-IV in Paris. The mother was a dentist and her sister an ophthalmologist, and the newspaper also reported that the twins were the granddaughters of Algerian novelist Muloud Ferraun. Police said the family “withdrew from society” before committing suicide. Only 15-year-old son survived the 20-meter jump (Image: AFP via Getty Images) Two police officers knocked on the door of the apartment at 6:15 a.m. local time, asking to talk to dad about arranging his son at home. However, after a voice asked who was at the door, they said nothing more and the police, not being able to enter the apartment, left. Then, less than an hour later, just before 7 a.m., all five jumped off the balcony within five minutes. Did you know that you can stay up to date with the latest news by subscribing to our daily newsletter? We send out a newsletter in the morning and at noon that covers the latest headlines every day. We also send updates for the coronavirus at 5 p.m. weekdays and a collection of stories to read on weekday Sunday afternoons. Registration is simple, easy and free. You can display your email address in the registration box above, click Register and we will do the rest. Alternatively, you can sign up and view the rest of our newsletters here. Police could not find any evidence of a fight, apparently confirming that they all jumped on their own. A ladder was found on the balcony from where they jumped. Police said: “Before or during the events, no witnesses, including the two police officers who were on the scene as of 6:15 a.m. and passers-by at the foot of the building, did not hear the slightest noise or crying coming from the apartment or balcony. “Technical investigations show no warning signs of such an act.” Police say the family was entrenched in conspiracy and survival theories (Image: AFP via Getty Images) They added that from the beginning of the pandemic, the family had become increasingly interested in “conspiracy theories and survival”. The family lived almost in self-sufficiency, cutting off the outside world. They have amassed a stock of food, which occupied most of their living space. Only the mother’s twin sister worked outside the home, with neither mom nor the eight-year-old registered with the local authorities. Police added that evidence suggests the family feared authorities would intervene in their lives. The Samaritans is available 24/7 if you need to talk. You can contact them for free by calling 116 123, email [email protected] or head to it Website to find your nearest branch. You count.