The leader of the Forsane Alizza group, Mohammed Achamlane, was among 19 people arrested Friday over alleged connections to radical Islam, Missamou said.
The raids came a week after Merah, who killed seven people in a series of attacks, was shot dead after a long siege in the southwestern city of Toulouse.
French media reports suggested Merah had developed connections with the pro-al Qaeda group, which has a cluster of followers in Toulouse.
Forsane Alizza was outlawed in January for encouraging French citizens to travel to Afghanistan to fight jihad. Read More