Six people were stabbed at the bustling Gare du Nord station in Paris by the assailant, who was then shot and captured by police, according to authorities.
Trains to northern France, London, and northern Europe leave from the popular commuter hub known as the Gare du Nord.
According to a person familiar with the investigation, police were examining the stabbings as attempted murder and not as a terrorist assault.
It was not immediately clear what motivated the attacker.
According to authorities, only one of the six people was critically hurt in the incident at 6:42 am, while the other five only suffered minor wounds.
Interior Minister Gerald Darmanin told reporters on the scene that the entire situation was over in less than two minutes.
it was not immediately evident what kind of weapon the assailant had used.
Mr. Darmanin clarified that it was a “threatening weapon” rather than a knife when the police initially identified it as a bladed object.
According to Le Parisien, it was thought to be “a kind of awl,” a sharp, pointed tool.
After the police fired three shots, the attacker suffered chest wounds. He was transferred to a hospital where, according to Darmanin, he was battling for his life.
Off-duty police officers in plain clothing who used their service guns to stop the attack, were the police who intervened, according to him.
Despite being armed, the police officers “were returning from duty at police headquarters to take their train and go home,” according to Darmanin.
Even though they were not on duty, he added, they were allowed to wield their firearms.
One of the border police officers assigned at the station received a minor wound.
Several people were hurt this morning at the Gare du Nord by a single individual, Mr. Darmanin had earlier tweeted.
“He was quickly neutralised. Thank you to the police for their effective and courageous response”.
As police blocked off the station and constructed thick white curtains around the attack area, the incident created delays for trains at the station during the morning rush.
However, no services were postponed, an SNCF rail operator official told AFP.
With 700,000 travellers per day, the Gare du Nord is one of the busiest train stations in the world.
It serves as the starting point for services provided by Eurostar and Thalys to the UK, Belgium, the Netherlands and Germany.
After a series of deadly attacks by Islamist radicals and others since 2015, France is still on high security alert.