The facts occurred in the Guillotière Gabriel-Péri metro station.
During the night from Saturday to Sunday, an injured man was found on the bridge over the tracks.
The victim had been stabbed in the chest, the knife used to attack it was also discovered on the spot.
Hospitalized in serious condition, it has still not been identified according to Le Progrès.
An investigation was opened to understand the circumstances of this attack, and try to identify the authors (s). The video surveillance of the Lyon metro station is notably under operation.
This is not the first time this year that a stabbing assault has occurred in the metro at La Guillotière. On January 26, a jostled individual had turned around before suddenly stabbed the onlookers in the neck.