The French Police on Saturday arrested nine people after a school teacher was beheaded in broad daylight on a street in Paris. The attacker was shot dead by the police a few moments after he beheaded 47-year-old history teacher Samuel Paty on Friday.

The police is now investing if the Islamist sympathiser had acted alone or had support of any of these nine accused. According to the French Police, the attacker was an 18-year-old Chechen origin boy.

Earlier in October, Paty had shown the cartoons of the Prophet Mohammad while delivering a lecture on the freedom of expression in a civics class. Paty’s action angered the parents of some Muslim students, who believe that any depiction of the Prophet Mohammad is blasphemous.

Prime Minister Jean Castex called the attack “Islamist terrorism” and promised to take strict action against the conspirators.

“The state, in solidarity with teachers, will react in the most decisive way so that the republic and its citizens live freely! We will never give up. Never,” Castex wrote on Twitter.

News agency Reuters quoted Castex as saying: “I want to share with you my total indignation. Secularism, the backbone of the of the French Republic, was targetted in this vile act.”

Among those who have been arrested in the case include four of the attacker’s relatives, including a minor. They were detained in the middle-class suburb of Conflans-Sainte-Honorine. The five other accused were arrested overnight, including two parents of the students at the College du Bois d’Aulne. Paty had delivered the lecture at the same school.