French cops shot and wounded a man who rushed towards a group of policemen with a knife shouting "Allahu akbar".
The terrifying incident took place in the eastern city of Metz on Sunday, with officers firing into the man's thigh.
Officials say he was known to authorities and was being monitored over links to militant groups.
It comes just two days after a man went on a knife rampage in the suburb of just outside Paris on January 3, killing one person and wounding two.
The Villejuif attacker was subsequently shot dead by police.
The Metz local public prosecutor's office said it was in contact with the French anti-terrorism prosecutor's department over the incident, while French Interior Minister Christophe Castaner added he was monitoring the situation closely.
He tweeted: "I praise the quick thinking of the @PoliceNat57 (Moselle police force), which intervened to apprehend the individual.
"A probe is underway to determine the precise motivation and circumstances behind the act."
The Metz local prosecutor's office said the suspect suffered gunshot wounds to the thigh. He was then taken away.
It added that the suspect, whom it did not name, was on an official list of those monitored for links to militant groups.
Paris has suffered major attacks by Islamist militants in recent years.
Co-ordinated bombings and shootings in November 2015 at the Bataclan theatre and other sites around Paris killed 130 people
- the deadliest attacks in France since World War Two.
