About 12 Romanian people were reportedly involved in the fight on the south eastern edge of the French capital.
Witnesses claim a man, after having been beaten with a bar, fled the scene in a car. In an attempt to take control of the vehicle, the man pushed a pregnant woman out of it on a motorway just outside the city.
The pregnant woman was taken to hospital, and the man was arrested shortly after the incident.
Police do not yet know the cause of the fight, but have confirmed all those taken in for questioning have been placed in custody.