Ten people were in custody on Saturday over the fatal stabbing of a teacher in the French town of Arras, a police source told AFP.

Several members of the attacker’s family were being held following the stabbing on Friday, the source said. Two Belarusians were among those in custody, another police source said.

Yesterday, the regional Pas-de-Calais authority said the suspected assailant, who also wounded a second teacher and a school security guard in the attack, was arrested.

The suspect was a Russian-born Chechen and former student of the Lycee Gambetta high school where the attack happened, a police source said yesterday.

He was on a watchlist of people known as a potential security risk in connection to radical Islamism, the police source added.