French President Francois Hollande has vowed to destroy the Islamic State group after its atrocities in Paris, promising tough new anti-terror measures at home and intensified bombing of Syria.


France and Belgium staged dozens of raids yesterday on suspected extremists as the manhunt continued for an eighth jihadist, including in a known radical hot spot in Brussels where some of the attackers are thought to have lived. Describing the coordinated attacks that killed 129 people as "acts of war," Hollande urged a global fightback to crush IS and said he would hold talks with his US and Russian counterparts on a new offensive.


Friday's "acts of war... were decided and planned in Syria, prepared and organised in Belgium (and) perpetrated on our soil with French complicity," Hollande told an extraordinary meeting of both houses of parliament in Versailles.


"The need to destroy Daesh (IS) ... concerns the entire international community," he told lawmakers, who burst into an emotional rendition of the Marseillaise national anthem after his speech.


Hollande said the aircraft carrier Charles de Gaulle would be deployed to the eastern Mediterranean to "triple our capacity to take action" against IS in Syria. "We will continue the strikes in the weeks to come ... There will be no respite and no truce," he said.