View from inside the RER D commuter train of the English "Welcome Aboard RER D" message in Paris, France on October 19, 2024. ANTOINE BOUREAU/Hans Lucas/AFP via Getty Image

Four teens were wounded, two of them seriously, by an axe wielded during a fight on Monday on a suburban train outside Paris, police sources said, with the main suspect later arrested.

One of the victims - all aged 16 or 17 - had a hand cut off and another had their skull split open.

Two others were more lightly injured in the struggle that one police source said had broken out around 8:00 am as the teenagers involved 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 people were brought to hospital and none were in danger for their life, the source added.

The main suspect, a 16-year-old, was later arrested at his home and held in custody, another police source said.

An axe was found and confiscated during the search, they added.

The incident happened while the RER suburban express train was at the station of Ozoir-la-Ferriere southeast of Paris.

A message posted to the official X account for the RER E said: "An incident on the TUVA train currently at the Ozoir station requires the train to remain at the platform. We are waiting for police intervention."

A subsequent post said some traffic had slowed in both directions due to an "altercation on board a train at Ozoir station."

The RER E line runs east-west through Paris and its suburbs.

Source