Elite French police arrested at least ten suspected Islamists in early morning raids on Wednesday in several cities, a police source said.

The raids were notably carried out in the southern port city of Marseille as well as Roubaix near the Belgian border, and in several other locations in the country’s south and southwest, a source told AFP.

The raids follow the arrest of 19 people on March 30 a week after police snipers shot dead al-Qaeda-inspired gunman Mohammed Merah, who killed three Jewish school children, a rabbi and three soldiers in a spate of attacks around Toulouse.

“Those arrested have a similar profile to Mohammed Merah,” a local police source told Reuters. “They are isolated individuals, who are self-radicalized,” the source said.