Anti-terror police found a haunting text message on a phone belonging to truck terrorist Mohamed Lahouaiej Bouhlel.1smsThis latest revelation backs up a theory from French detectives that a secret IS-linked terror network may have planned the attacks that massacred 84 people.

The unnerving message read: “I have the material.”

It was unclear what ‘material’ he might be referring to but a weapons cache including guns and grenades was found in the back of his rented truck. French prosecutors said 31-year-old Bouhlel had driven down the Promenade twice in the days leading up to the attack.

He scouted the Promenade des Anglais on Tuesday 12 July and Wednesday 13 July and could be seen observing the scene ‘very carefully’, reports Europe1. After the attack investigators found a four-word message sent from his mobile that read: “I have the material,” reports Nice Matin.