President Francois Hollande addresses emergency parliamentary session on Paris attacks
President Francois Hollande addresses emergency parliamentary session on Paris attacksReuters

The Paris attacks were decided in Syria, prepared in Belgium and perpetrated with French help, French President Francois Hollande said Monday.

Friday's "acts of war... were decided and planned in Syria, prepared and organised in Belgium (and) perpetrated on our soil with French complicity," he said, speaking to an exceptional joint gathering of parliament in Versailles, south of Paris.

Hollande also pledged that France would "intensify its operations in Syria", hours after the first series of air strikes against the Islamic State (ISIS) terrorist group since the Paris attacks.

"We will continue the strikes in the weeks to come," Hollande told lawmakers in a solemn address.

The coordinated attacks in Paris on Friday killed 129 people and left around 300 wounded. They were carried out by three groups of terrorists, including both French Muslims and foreign ISIS infiltrators who arrived in Europe as "refugees."

Hollande also told legislators in the address, which was televised live, that he would be moving to extend the current state of emergency declared throughout France by three months. 

France would work to "not just contain, but destroy" ISIS, he vowed.

AFP contributed to this report.