A female referee was injured and had to leave the pitch after being knocked to the ground during a friendly between French club Metz and Fortuna Sittard of the Netherlands.
Mathilde Demoncay reportedly suffered concussion, external when she was knocked to the ground as she tried to break up a melee between the players.
Tension flared in the 40th minute when two opposing players confronted each other after a shirt-tugging incident, with other players rushed to join in the confrontation.
Demoncay ended up on the ground after attempting to intervene, falling heavily.
She remained on the pitch for several minutes, holding her arm, while assistant referees, security personnel and medical staff ran on to the pitch to restore order and assess her condition.
The 26-year-old Demoncay resumed as the assistant referee after play restarted but left the field at half-time, with another assistant taking over her duties.
Metz won the game 3-1.