Two people have been killed and at least four others wounded in a knife attack in south-east France, officials have said.
Witnesses said the attacker entered a tobacconist in the town of Romans-sur-Isère, near Grenoble, and stabbed the owners and a customer.
He then went to a nearby butcher's shop and attacked more people.
Police said a suspect had been arrested. The motive for the attack is not clear.
Anti-terror police have not taken over the investigation, but said they were monitoring developments.
According to French media, the suspect is a 33-year-old man who told police he was born in Sudan. He was not known to the police or intelligence services, news website France Bleu reported.
One of the wounded is said to be in a critical condition.
Prime Minister Emmanuel Macron tweeted: "My thoughts are with the victims of the Romans-sur-Isère attack – the injured, their families."
He promised light would be shed on "this odious act".
Mes pensées accompagnent les victimes de l'attaque de Romans-sur-Isère, les blessés, leurs familles. Toute la lumière sera faite sur cet acte odieux qui vient endeuiller notre pays déjà durement éprouvé ces dernières semaines.
— Emmanuel Macron (@EmmanuelMacron) April 4, 2020