France’s Prime Minister Manuel Valls has warned that his country could face chemical or biological attack from terror groups, as lawmakers debate the state of emergency extension following last week’s attacks in Paris.

Belgian police have meanwhile raided properties linked to suspected Paris attackers Bilal Hadfi and Salah Abdeslam.

Seven raids took place in and around Brussels, and one person was detained, Belgian media reported.

November 13 attacks in Paris killed 129 people.

PM Manuel Valls was addressing France’s lower house of parliament before its deputies voted to extend the state of emergency by three months.

He told lawmakers that “terrorism hit France, not because of what it is doing in Iraq and Syria … but for what it is”.

“What is new are the ways of operating; the ways of attacking and killing are evolving all the time,” Manuel Valls said.

“The macabre imagination of those giving the orders is unlimited. Assault rifles, beheadings, suicide bombers, knives or all of these at once.”

Manuel Valls also called for Europe to adopt measures on sharing information about airline passengers as a way of protecting collective security.

French police officers will be allowed to carry their weapons while off duty as long as they wear an armband to identify them, under a police directive issued to coincide with the state of emergency.

Paris police have extended their ban on gatherings and demonstrations until midnight on November 22, although they will be allowed at the various sites attacked on November 13.

It remains unclear whether the suspected ringleader of the attacks was killed in yesterday’s raid in Paris.

French authorities say the raid on a flat in the northern suburb of Saint-Denis foiled another attack, reportedly planned for the La Defense business quarter of western Paris.

Eight people were arrested in the raid, in which police fired over 5,000 rounds of ammunition, but those arrested did not include Abdelhamid Abaaoud – suspected of being the man who organized the Paris attacks.

At least two people were killed in the raid, one of them a woman who blew herself up with a suicide vest.

She is widely reported to be Hasna Aitboulachen, a cousin of Abdelhamid Abaaoud.

Further attacks by ISIS were likely elsewhere in Europe, according to the head of the EU’s law enforcement agency Europol.