According to French Prime Minister Manuel Valls, the man who killed at least 84 people in a truck attack on Thursday in Nice was "radicalized very quickly." Valls' remarks confirmed reports from unnamed officials earlier this weekend. Though the Islamic State claimed responsibility for the attack, officials have not yet found evidence that 31-year-old Mohamed Lahouiej Bouhlel was connected to the miiltant group. "The investigation will establish the facts, but we know now that the killer was radicalized very quickly," Valls said in an interview. "The claim on Saturday morning by Islamic State and the fast radicalization of the killer confirms the Islamist nature of this attack."