UPDATE: 6:40 a.m. EDT - The terror group Daesh, also known as the Islamic State, has claimed responsibility for the attack. It said one of its members carried out the assault, but provided no evidence. However, the French police said they were not so sure about the claim by the group.

"The assailant has been described as unstable since 2014. Daech [Daesh] claims everything, it is not a criterion for defining a terrorist motivation,” a police source told local media outlet Le Parisien.

A resident who knew the attacker said, "He was nice, he went little to the mosque, had a job, I know him since childhood. He stayed for a while at the Charcot psychiatric hospital.”

French Interior Minister Gérard Collomb visited the crime site and lauded the excellent work carried out by law enforcement in a tweet.

UPDATE: 6:20 a.m. EDT — The name of the suspect in Thursday’s attack in Trappes, France, was released by local media. The man who killed two people and injured one outside a supermarket was identified as Kamel S. He had a history of propagating terrorist ideals, was monitored by the country’s intelligence agencies and was described as “fragile.”

Also, the two victims who were stabbed to death by him, both female, were reportedly his mother and sister. The third victim, who was injured, was a passerby.

According to local reports, the incident took place around 9.30 a.m. local time (3:30 a.m. EDT). Armed with multiple knives, Kamel assaulted his sister in the street before rushing inside the family's house, shouting: “Allahu Akbar, if you enter I smoke you all.”

He was shot down by the police when he came out of the house at 10:20 a.m. local time. RAID, the elite tactical unit of the French police, also arrived the scene to aid with the operation but the suspect was already dead by then. The police discovered the mother’s body after they entered the suspect’s house.

Original story:

A man with a knife attacked and killed two people, also seriously injuring another, in the parking lot of a supermarket in Trappes, a suburb west of Paris, on Thursday, according to BFM-TV.

The assailant shouted “Allahu Akbar” before carrying out the attack, although the French police have not confirmed whether it was a terrorist attack. A local journalist reported the suspect, who was shot and killed by the police, was 36 years old. After the attack, the deceased attacker took shelter in a house before he was shot.

According to some unconfirmed reports, the man was sentenced in 2016 for being a “terrorism apologist,” was known to promote “radical Islamist ideology” and had a history of family dispute.

The condition of the injured is not known. A security perimeter was put up in place around the crime scene. The police tweeted saying the individual responsible for the attack had been neutralized. Citizens were told to avoid the area for their own safety.

French Interior Minister Gérard Collomb tweeted: “#Trappes: the individual has been neutralized. My first thoughts are with the victims and their loved ones. I want to salute the reactivity and the exemplary mobilization of our police forces. They are already investigating to establish the circumstances of this tragedy.”

This is a developing story.