>> The truck driver behind the Bastille Day attack in Nice was radicalized quickly, the assessment of French Prime Minister Manuel Valls on Sunday. At least 84 people were killed when Mohamed Lahouaiej Bouhlel careered a truck through a crowded street. Islamic State has claimed responsibility for the attack. But authorities haven't produced any evidence that 31 year old Bouhlel had links to the group.
No radical materials have been found in his home. Reuters' Andy Callus says Bouhlel's computer and phone are still being searched.>> So the experts we've spoken to say the link doesn't have to be anything more than tenuous. There are groups of people who can be inspired by Islamic State without having any particularly close links to them.
>> Friends and family paint a picture of an unstable man, but not a particularly religious one. His father says he had previously suffered a nervous breakdown and anger issues. Neighbors living in Bouhlel's apartment building in Nice described him as frightening and always alone. French authorities believe Islamic State took advantage of his instability.
Several people have now been detained in relation to the attack after police shot Bouhlel dead at the scene.>> Another two people were arrested today, a man and a woman. That brings the total being held for questioning in Nice to seven, as of this morning. But the first person to be taken in for questioning was Bouhlel's wife.
They're estranged as a couple and they're getting divorced. She was allowed to go today.>> The attack has put already fraught security officials under more pressure. Some 26,000 military reserves have been called upon as reinforcements. With the Interior Minister urging patriotic citizens to sign up to help relieve exhausted security forces.