French Prime Minister Manuel Valls

French Prime Minister Manuel Valls revealed Thursday that five terror attacks had been "foiled" in France in recent months.

He told radio station France Inter that "numerous attacks had already been foiled -- five if you take into account the attack which happily did not take place at Villejuif" on the outskirts of Paris on Sunday.

A 24-year-old Franco-Algerian IT student is being held by police investigating an alleged plot to attack a church near the French capital.