A youth counselor discovered a severed head while scouting ahead of an activity in the Holot area in Rishon Lezion, near Highway 431, between the Rishonim Mall and the Paz gas station.
She immediately called the police, triggering a large response from the Central District police, who arrived at the scene.
Police found a letter at the scene, left behind by a 22-year-old young man known to the mental health system.
An investigation was immediately launched.
This is a developing story.