A history teacher who had shown caricatures of Islam's Prophet Muhammad during an open discussion with students was beheaded on the street of France on Friday. Reportedly, the police have shot dead the suspected killer, authorities said.
Notably, the probe on murder has been initiated by the French anti-terrorism prosecutor with a suspected terrorist motive, the prosecutor's office said.
The horrendous incident took of murder took place in a middle school situated in the town of Conflans-Sainte-Honorine while the suspect was killed by police in Eragny. Both towns are located in the Val d'Oise region in Paris's northwest.
The suspected attacker was believed to be an 18-year-old unknown to the police. He was spotted by patrol police in an adjacent commune carrying a knife.
He reportedly shouted "Allahu Akbar", or "God is Greatest", before the attack.
Officers shot him dead after he refused to surrender.
President Emmanuel Macron has also paid a visit to the school.
"One of our fellow citizens was murdered today because he was teaching students freedom of expression," Macron told the media on Friday evening after visiting the middle school in Conflans-Sainte-Honorine hours after the attack.
"It is a teacher that this terrorist killed because he wanted to destroy the Republic...destroy the possibility of making our children free citizens," he added.
Macron stressed that terrorists will not divide France and obscurantism will not win.
The attack triggered a deluge of denunciation as well as calls for unity and more acts to uproot radical Islamism.
"Tonight, it is the Republic that is under attack with the despicable assassination of one of its servants, a teacher," Education Minister Jean-Michel Blanquer tweeted.
"Unity and firmness are the only answers to the monstrosity of Islamist terrorism," he added.
Also taking to Twitter, former President Francois Hollande denounced "a terrible assassination of a teacher".
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Hollande, who saw France rocked by its deadliest terrorist attacks in 2015, stressed that "more than ever, we must be united in the face of barbarism and obscurantism."
Last month, a man stabbed two people outside the former offices in central Paris of the satirical weekly magazine Charlie Hebdo, which publishes controversial cartoons, including those of Prophet Muhammad.
The offices were the scene of an attack in January 2015 that saw 12 people killed, including many of the magazine's staff.
Fourteen people are currently on trial over the attack.
On November 13, 2015, a series of terrorist attacks hit Paris and the city's northern suburb. Some 130 people were killed in several mass shootings and suicide bombings.
Earlier in August, Minister of the Interior Gerald Darmanin said that the risk of terror attacks in France remains extremely high, adding that 8,132 individuals had been registered on a national warning list of Islamist radicalization.