Six teenagers go on trial Monday in Paris for their alleged roles in the beheading of a teacher who showed caricatures of the prophet of Islam to his class, a killing that led authorities to reaffirm France's cherished rights of expression and secularism.

Samuel Paty, a history and geography teacher, was killed on Oct. 16, 2020, near his school in a northwest Paris suburb by an 18-year-old of Chechen origin who had become radicalized. The attacker was in turn shot dead by police.