The French prime minister says authorities knew attacks were being prepared and has warned that more are expected to come, reports The Independent.
Manuel Valls told the French media Friday's shootings were "planned in Syria", and said Europe should be prepared for a repeat attack in the coming few days and weeks.
The prime minister also confirmed that police had carried out a series of pre-dawn raids on Sunday night, making dozens of arrests linked to the atrocities of Friday night's Paris attacks that left 129 people dead.
According to reports, anti-terror police launched operations in Bobigny-Paris, Toulouse, Grenoble, Jeumont and Saint-Denis with officers reportedly removing firearms and cash from some properties.
The raids came after the French air force launched a series of "massive" air strikes on Sunday night, targeting the Isis militant group which has claimed responsibility for the shootings.
Twelve aircraft, including 10 fighter jets, dropped a total of 20 bombs in the biggest air strikes since France extended its bombing campaign against the extremist group to Syria in September, the defence ministry said.
Officials said the strikes hit the jihadist group's de facto captial of Raqqa in Syria, where Iraqi intelligence officials say the attacks on Paris were planned. The raids reportedly destroyed a jihadi training camp and a munitions dump, among other targets.