Four teenagers were wounded, two of them seriously, after an axe was used during a fight on a suburban train outside Paris according to French police sources, reports The Guardian.
One of the victims, all aged 16 or 17, had a hand cut off and another had their skull split open. The main suspect in the incident was later arrested.
The two other victims were less seriously injured in the altercation, which a police source said broke out at about 8am (0700 GMT) as the teenagers were on their way to secondary school.
It was not immediately clear what triggered the fight, in which weapons including the axe, a knife, a samurai sword and baseball bats were used.
All the wounded were taken to hospital and none had life-threatening injuries, the source added.