French police staged 128 raids in the early hours of Tuesday, Interior Minister Bernard Cazeneuve said, as authorities stepped up their investigation into the country’s worst-ever terror attacks.

French police staged 128 raids in the early hours of Tuesday, Interior Minister Bernard Cazeneuve said, as authorities stepped up their investigation into the country's worst-ever terror attacks.

Authorities had made 23 arrests and seized 31 weapons including a rocket launcher in a broad sweep of raids across the country the previous day.

160 people were killed on Saturday when a terrorist group stormed a Paris theatre following two blasts near Stade de France.