Two people have been arrested in connection with killing of three children and a rabbi at a Jewish school in Toulouse earlier this year.
A Gypsy and his former partner have been questioned by police on suspicion of acting as accomplices to self-proclaimed “Islamic warrior” Mohammed Merah.
Mr Merah, who had French citizenship, said he was motivated by the death of Palestinians and military action by France abroad.
Mr Merah, 24, was shot on March 22 by police after a 32-hour siege. Two police officers were wounded during the stand-off. He is held responsible for the deaths of seven people from March 11-19.
President Francois Hollande pledged to tighten anti-terror laws following the attacks.