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The extremist organisation appears to have been planning a second attack in the city on the Mediterranean coast a month after it caused havoc with the assault on the Promenade des Anglais when a 19-tonne truck was driven through crowds of people watching a fireworks display for more than a mile.

French investigators have been analysing text messages exchanged between two alleged accomplices of the driver of the truck Mohamed Lahouaiel Bouhlel, 31, just eight days before a truck was deliberately driven into a crowd of people in the popular French resort, killing 84 people.

Brother-in-law of Mohamed Lahouaiej Bouhlel, Hamdi Zagar, who is currently under investigation, sent two text messages on July 6 to Mohamed Oualid aka "Walid" Ghraieb, also arrested with the same charges.