A judicial official said Monday that the probe for "defense of terrorism" is aimed at establishing the conditions under which Souad Merah spoke. Her words, captured by a hidden camera, were aired this weekend in a TV documentary based on an account by Merah's oldest brother, Abdelghani. He claims the Merah children, of Algerian origin, were raised on anti-Semitism.
Interior Minister Manuel Valls denounced Souad Merah's words, saying they can only be seen as a defense of terrorism and of anti-Semitism.
Merah was killed in a standoff with police at his Toulouse apartment.