French Interior Minister Bernard Cazeneuve says three mosques have been shut down in France since the Paris attacks as part of a crackdown on extremist activities.

Cazeneuve told reporters it was the first time mosques are being closed in France "on grounds of radicalization."

One of the mosques, 35 kilometers (22 miles) east of Paris in Lagny-sur-Marne, was targeted by raids early Wednesday, with police seizing a 9mm revolver, a computer hard disc and jihadist propaganda. Cazeneuve said the mosque also had a non-authorized Quranic school.