France's interior minister said Monday that police are investigating dozens of people who allegedly issued messages of support for the attacker after the beheading of a history teacher near Paris.

Gerald Darmanin said on French radio Europe 1 that at least 80 cases of hate speech have been reported since Friday’s attack.

Samuel Paty was beheaded in Conflans-Sainte-Honorine, northwest of Paris, by an 18-year-old Moscow-born Chechen refugee, who was later shot dead by police. Police officials said Paty had discussed caricatures of Islam’s Prophet Muhammad with his class, leading to threats.

A demonstrator displays on his back a portrait of slain teacher Samuel Paty during a demonstration Sunday Oct. 18, 2020 in Paris. (AP Photo/Michel Euler)

FRANCE MOVES TO EXPEL 231 RADICALIZED FOREIGNERS AFTER ASSASSINATION OF TEACHER

French President Emmanuel Macron held a defense council on Sunday at the Elysee presidential palace. The government will reinforce security at schools when classes resume on Nov. 2 after two weeks of holidays, Macron's office said.

Macron met with Paty's family on Monday morning, the French presidency said.

Macron also will meet with the members of France's leading Muslim organization, the French Muslim Council, or CFCM, later in the day.

A national homage is to be held for Paty on Wednesday.

Players, coaches, and referees at high-level soccer matches this weekend will wear a black armband in a tribute to Paty. The French league said in a statement Monday that a minute of silence will be observed before kick-off at all professional matches in leagues 1 and 2.

Tens of thousands of demonstrators gathered on Sunday across France in support of freedom of speech and in memory of the slain 47-year-old teacher.

French authorities said they detained 11 people following the killing.

FRANCE ATTACK: TEACHER KILLED IN GRUESOME ASSAULT NEAR PARIS, TERROR INVESTIGATION LAUNCHED

A woman lights a candle on Republique square during a demonstration Sunday Oct. 18, 2020 in Paris. (AP Photo/Michel Euler)

Darmanin said they include the father of a student and an Islamist activist who both “obviously launched a fatwa," or religious ruling, against the teacher.

A man who said he was the father of a student had posted a video on social media asserting that Paty had shown an image of a naked man and told students it was “the prophet of the Muslims.” He called on other angry parents to contact him, and relay the message.

Darmanin said authorities were also looking into about 50 associations suspected of encouraging hate speech. Some will be dissolved, he said.

The president of the Conference of Imams in France, Hassen Chalghoumi, said “we are hurt, we are condemning this barbaric act," on French news broadcaster BFM TV. “Samuel is a martyr of freedom.”

“Barbarism has no place in schools nor elsewhere in France,” he said.

A demonstrator holds a French flag with the slogan "Freedom of Speech" during a demonstration Sunday Oct. 18, 2020 in Paris. Demonstrations around France have been called in support of freedom of speech and to pay tribute to a French history teacher who was beheaded near Paris after discussing caricatures of Islam's Prophet Muhammad with his class. Samuel Paty was beheaded on Friday by a 18-year-old Moscow-born Chechen refugee who was shot dead by police. (AP Photo/Michel Euler)

Chalghoumi, who is an imam in Drancy, a suburb northeast of Paris, said he had received death threats and insults on social media from radical Islamists in recent days.

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Justice authorities opened an investigation for murder with a suspected terrorist motive. At least four of those detained are family members of the attacker, who had been granted 10-year residency in France as a refugee in March. He was armed with a knife and an airsoft gun, which fires plastic pellets.

Anti-terrorism prosecutor Jean-Francois Ricard said a text claiming responsibility and a photograph of the victim were found on the attacker's phone.