In relation to the July 2016 lorry assault in Nice, southern France, which resulted in the deaths of 86 people, all eight offenders have been found guilty.
A special court in Paris condemned seven men and one woman to prison terms ranging from two to 18 years.
Five others were found guilty of supplying firearms, while three were found guilty of associating with a terrorist.
On Bastille Day, the assailant, Mohamed Lahouaiej-Bouhlel, died after ramming his truck into the crowd.
A gathering of over 30,000 people, celebrating France’s national day on July 14, trampled 31-year-old Tunisian as he drove through them.
Lahouaiej-victims Bouhlel’s included 15 children as he raced along the Promenade des Anglais, a beachside avenue in the coastal city, for more than 2 km (1.2 miles).
One of the bloodiest atrocities in recent European history, the massacre resulted in hundreds of injuries.
Following a protracted trial in a special courtroom in the French capital, the judgments were made public on Tuesday.
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The two Tunisian nationals closest to the murderer, Mohamed Ghraieb and Chokri Chafroud, received the harshest sentences of 18 years in prison. Both men have adamantly denied any misconduct.
Another defendant, Ramzi Arefa, received a 12-year prison term for giving the assailant’s attacker firearms.
Prior to the attack, the killer had texted and messaged the three men on Facebook. Although no one accused of being a member of the conspiracy, the court determined that they were generally aware of the attacker’s terrorist sympathies.
On allegations of trafficking in firearms or engaging in a criminal conspiracy, the five remaining defendants—four citizens of Albania and one from Tunisia—received sentences ranging from two to eight years in prison.
The extremist organization known as the Islamic State (IS) claimed responsibility for the attack, but French police were unable to discover any evidence linking Lahouaiej-Bouhlel to IS.
According to experts, the two-month trial provided an opportunity for survivors and families of victims to testify about their memories of a night that left the city of Nice deeply scarred.
The trial was held in the same purpose-built courtroom that held hearings for the November 2015 Paris attacks, which claimed 130 lives and were the deadliest attack on French soil during a time of peace. The trial was held at the storied Palais de Justice in Paris.