Two presented themselves voluntarily to the investigators, and three were arrested at their homes by the criminal brigade.
Five young people in all, including four minors, were placed in police custody on Wednesday on suspicion of being involved in the death of a 16-year-old teenager in the 17th district of Paris.
The victim, stabbed in the abdomen, died in hospital from his injuries despite the intervention of the emergency services, a police source told AFP.
She was "well known" to the police, according to a source familiar with the matter.
A cell dedicated to monitoring rival gangs
The hypothesis of a confrontation between rival gangs, in particular those of the Porte d'Asnières and the Porte de Saint-Ouen, was quickly the lead favored by the investigators.
The police force was reinforced in this district after this tragedy, at the request of the prefect of police Laurent Nuñez, to "avoid a ''return match''".
The police headquarters, via a dedicated unit, monitors 45 bands in the Paris area, including 17 in Paris.
Paris
Seine-Saint-Denis: Vital prognosis for a teenager after a bare-knuckle fight
Miscellaneous facts
Paris: A 16-year-old boy killed in the 17th after a knife fight
Paris
Ile-de-France
Rival bands
Murder
Police