PARIS—France’s anti-terrorism prosecutors who took over the investigation of a fatal knife rampage near Paris said they had established that the attacker had been radicalized and had carefully planned an act intended to spread terror.
A man identified only as Nathan C. fatally stabbed one person Jan. 3 in a park in Villejuif, just outside Paris, and wounded two others. The attacker, who had a history of drug and psychiatric problems, was shot dead by police.
