French reports say the attacker appeared to have mental problems and add this information:
At the very beginning of the afternoon, on January 3, a man stabbed several people in a park in Villejuif (Val-de-Marne), killing one of them. A few hours later, the assailant was identified. Recently converted to Islam, he was not known for radicalization by the intelligence services. According to the Créteil prosecution, the madman shouted “Allahou Akbar!” at the time of the attack.
Why does the additional information appear in French reports, but it is missing from US reports?