A knife-wielding Chechen refugee who was on a terror watch list in France slaughtered a teacher at his former high school and critically wounded two other people after allegedly yelling “Allahu Akbar” in northern France Friday, according to official and local media.

The suspect, identified as 20-year-old Mohammed Mogouchkov, fatally stabbed Dominique Bernard, 57, a French language teacher, and also injured a security guard and a gym teacher at Gambetta-Carnot School in the city of Arras, French outlet BFMTV reported.

The savage attack took place in the school’s parking lot around 11 a.m. local time and was captured on video, which shows three people trying to fend off the knifeman with a chair.

The suspect, wearing a jacket and white sneakers, is seen delivering knife blows to one of the men on the ground.

“He’s got a knife, he’s got a knife,” one witness is heard exclaiming.

Students were placed on lockdown for hours inside the building as frantic parents rushed to the school.

“We were leaving class to go to the canteen when we saw the guy with two knives attacking the teacher, who had blood on him. He tried to calm him down and protect us,” a student told the outlet La Voix du Nord. “He told us to leave, but we didn’t really understand, so we ran and others went back upstairs.”

Another student said an alarm went off and students assumed it was a drill.

French interior minister Gerald Darmanin said on X the “perpetrator was arrested” as police conducted its operation at the school.

Mogouchkov’s 16-year-old brother was also taken into custody Friday.

The National Anti-Terrorism Prosecutor’s Office said it was investigating the attack as potential terrorism.

The deadly school attack that sent shockwaves through France comes on the day that Hamas’s former leader, Khaled Meshaal, called on all Muslims to wage a “day of Jihad” and stage protests against Israel.

Mogouchkov was identified by the national police as a Russian national of Chechen descent. He arrived in France as a refugee in 2008, when he was 5 years old.

The 20-year-old was known to French law enforcement agencies and was on a state ‘Fiche S’ watchlist of people known as a potential security risk.

Mogouchkov had been closely monitored since the summer with tails and telephone surveillance — and was stopped as recently as Thursday for a police check that found no wrongdoing.

Sliman Hamzi, a police officer who was one of the first on the scene said Mogouchkov shouted “Allahu Akbar,” or “God is great” in Arabic.

Hamzi said he was alerted by another officer, ran to the school, and saw a victim lying on the ground outside the school and the attacker being taken away.

“Colleagues arrived quickly but unfortunately couldn’t save the victim,” Hamzi said.

Police said two other men, a second teacher and a security guard, were in critical condition after being stabbed.

A school staffer said the assailant was specifically looking for history teachers and that he did not appear to be simply looking to settle a personal dispute.

Julie Duhamel, an official with the Unsa teachers’ union in the Pas-de-Calais region that includes Arras, told the outlet Franceinfo that teachers had noted Mogouchkov’s radicalization “a few years ago.”

The suspect’s phone conversations in recent days gave no indication of an impending attack, leading intelligence officers to conclude that he decided suddenly to act, intelligence services told The Associated Press.

Israel-Hamas war: How we got here

2005: Israel unilaterally withdraws from the Gaza Strip more than three decades after winning the territory from Egypt in the Six-Day War.

2006: Terrorist group Hamas wins a Palestinian legislative election.

2007: Hamas seizes control of Gaza in a civil war.

2008: Israel launches military offensive against Gaza after Palestinian terrorists fired rockets into the town of Sderot.

2023: Hamas launches the biggest attack on Israel in 50 years, in an early-morning ambush Oct. 7, firing thousands of rockets and sending dozens of militants into Israeli towns.

Terrorists killed more than 1,200 Israelis, wounded more than 4,200, and took at least 200 hostage.

Israeli Prime Minister Benjamin Netanyahu was quick to announce, “We are at war,” and vowed Hamas would pay “a price it has never known.”

The Gaza Health Ministry — which is controlled by Hamas — reported at least 3,000 Palestinians have been killed and more than 12,500 injured since the war began.

One of Mogouchkov’s brothers was arrested in the summer of 2019 by France’s counterterrorism intelligence service on suspicion of being involved in the planning of a foiled attack and is in jail, French intelligence said.

French President Emmanuel Macron traveled to the scene of the attack in Arras along with the interior and education ministers.

Macron paused before the blanket-covered body of the teacher, which was in the parking lot in front of the school. A puddle of blood was visible as forensic experts worked around the body.

Follow along with The Post’s liveblog for the latest on Hamas’ attack on Israel

Macron then went to meet with students from the school in an adjacent building.

Hundreds of police officers deployed around the school and nearby neighborhoods, including heavily armed units, and barricaded a wide perimeter around the school.

Friday’s attack echoed the beheading of French history teacher Samuel Paty in October 2020 at the hands of an 18-year-old radicalized Chechen.

Prosecutors said they were considering charges of terror-related murder and attempted murder against Mogouchkov.

France’s National Assembly, the lower house of Parliament, held a minute of silence for the victims of the Arras attack at the opening of its Friday session.

National Assembly Vice President Naima Moutchou said the assembly “expresses its solidarity and thoughts for the victims, their families, and the educational community as we learn that a teacher has been killed and several others have been injured.″

With Post wires