Sett att dom skulle varit vänner, kan det vara "blue whale" leken?
https://www.google.se/amp/metro.co.u...e-6477787/amp/
"Two schoolgirls, aged 15 and 16, fell to their deaths from a 14-storey block of flats, another, aged 15, fell from a fifth floor flat, while a 14-year-old girl died after being hit by a train.
Detectives are looking into the theory that they took part in tasks in the run-up to their deaths.
Yulia Konstantinova, 15, left a note on social media saying ‘end’ shortly after posting a picture with a blue whale while her friend Veronika Volkova, 16, wrote ‘Sense is lost… End.’ before she took her own life.
It was reported that two teenage boys were detained by police at the scene after allegedly filming the tragic double suicide."