French Prime Minister Manuel Valls said Monday that authorities believe new terror attacks are being planned in France and in other European countries following the carnage in Paris.

French Prime Minister Manuel Valls said Monday that authorities believe new terror attacks are being planned in France and in other European countries following the carnage in Paris.

"We know that operations were being prepared and are still being prepared, not only against France but other European countries too," he said.

France would be living with the threat of terror attacks "for a long time", he said.

Valls said he was struck by the fact that young people had been targeted in Friday's attacks on a concert hall, bars and restaurants and outside the Stade de France stadium that left 129 people dead.

"Once again the terrorists have attacked France, the French people, young people. Many young people are dead," he said.

Meanwhile on Monday, French police have carried out "more than 150" raids on suspected extremists since the attacks on Paris.

Police sources in Paris said "several dozen" pre-dawn raids were carried out in French cities on Monday, including in Bobigny, an eastern suburb of the capital.
Thirteen raids were carried out around the southeastern French city of Lyon, a local police source said.

They led to five arrests and the seizure of "an arsenal of weapons," including a rocket launcher, a Kalashnikov assault rifle, bulletproof vests, handguns and combat gear, the source said.

Police also carried out raids in Toulouse in southwestern France, where at least three people were arrested, according to the local prosecutor's office.

In the Alpine city of Grenoble, according to the local newspaper Le Dauphine Libere, at least half a dozen people were arrested and guns and money were seized.

Police have additional powers under a state of emergency declared after the coordinated attacks in Paris on Friday that left 129 people dead and more than 350 injured.