hasan rahali is a city councilor here. >> is it a cancer or disease in this neighborhood? >> it's a disease now. it's become a disease. >> reporter: he tells us how discrimination against muslims may have radicalized many young men. >> there are things that remind you you're different. you're coming from somewhere. you're second. there's the first level and the second level. >> second chas? >> second class. that's really the problem. >> when you were young and you felt the sting of discrimination, when you felt the pain -- >> hopeful, hopeful. you know, this desire, desire to beat. desire to make something bad. you are so -- the frustration in you, you need to expose it. >> you felt that? >> yeah, absolutely, in my heart. deep in my heart. >> reporter: following friday's massacre, officials now cracking down on these jihadist hotbeds. in france, 168 police raids took place. in all, 31 weapons and computers seized. 23 people have been arrested and questioned. another 104 placed under house arrest. authorities believe the plan was organized in belgium, carried out in france.