Both 15 years old, the suspects were remanded in custody and jailed.

They are indicted for the assassination of Alisha, 14, and face up to twenty years in prison.

A white march will be held in Argenteuil on Sunday in memory of the teenager. 

The two schoolchildren from Val-d'Oise indicted for the murder of their classmate, violently beaten and then drowned in the Seine on Monday in Argenteuil, were placed in pre-trial detention, the Pontoise prosecutor's office announced on Thursday.

The two suspects, a boy and a 15-year-old girl, were imprisoned in the juvenile quarters of two prisons, the prosecution told AFP.

They face up to twenty years in prison.

Alisha, 14, succumbed to an ambush Monday afternoon under the viaduct of the A15 motorway, according to the first elements of the investigation revealed to the press on Wednesday evening by the Pontoise prosecutor.

In this place away from homes, the young girl was said to have been brutally beaten and then thrown into the river, still conscious.

Relations that had deteriorated in recent weeks

Relations within the trio educated in Third in the same establishment, "three friends at the start", had deteriorated in recent weeks, between love affairs and "teenage trivia", according to prosecutor Eric Corbaux.

Things had escalated to the point that their vocational school had temporarily excluded the two suspects for the victim's harassment.

Alisha had seen her phone hacked and photos of her in her underwear posted on Snapchat.

The two indicted were to pass a disciplinary council on Tuesday, the day after the tragedy.

In police custody, the two teenagers "did not express any immediate remorse either," said Eric Corbaux.

A white march scheduled for Sunday

"It would be good not to find these cookie-cutter children guilty at a press conference. There is an instruction, there will be a trial, my client has the right to a defense," replied on Twitter Me Frank Berton, the lawyer for the indicted boy.

A white march will be held on Sunday in Argenteuil in memory of Alisha, the town hall of this city of 110,000 inhabitants told AFP.

This will start from the Cognacq-Jay high school, where the protagonists were educated, and will end on the banks of the Seine.