On November 4, a violent altercation on the RER E train in Ozoir-la-Ferrière resulted in four injuries, two of them serious. Witnesses reported a group of young individuals armed with an axe and a katana attacking others following a confrontation. A 16-year-old suspect, already known to police, was arrested after officers discovered an axe at his home. While initial reports suggested a severe hand injury, the prosecutor clarified that a finger was severed. An investigation for attempted murder has been launched, with police patrols increased on the line for safety.