The Wall Street Journal reports: The man who killed 84 people in Nice on Bastille Day had the support of several people and appeared to have been plotting his attack since last year, French prosecutors said Thursday.

Paris prosecutor François Molins said he asked a judge to place five people under investigation on preliminary terrorism charges. The five are in police custody.

“The investigation has not only provided more confirmation of the premeditation of the murderous attack of Mohamed Lahouaiej Bouhlel, but also establish that he had support and complicity in preparation of his criminal act,” Mr. Molins said.

Meanwhile, antiterror police conducted raids in a Paris suburb on Thursday, police officers said, as France attempts to sweep up weapons and people suspected of links to terrorism networks after the July 14 attack in Nice.

Police locked down a neighborhood in Argenteuil, a suburb 7 miles northwest of Paris, as they raided three sites, searching for weapons and explosives, one police officer said. Around 20 people were detained in the raids, another said. [Continue reading…]