French PM Manuel Valls has warned that France could face chemical or biological attack from terror groups, as MPs debate extending the state of emergency after the Paris attacks.

Belgian police are meanwhile raiding six properties in and around Brussels, linked to suspected Paris attackers Bilal Hadfi and Salah Abdeslam.

It remains unclear whether the suspected organiser of the attacks was killed in Wednesday's raid in Paris.

Friday's attacks killed 129 people.

Mr Valls was addressing the French parliament ahead of a vote to extend the state of emergency by three months.

He told MPs 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," the prime minister said.

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

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

Emergency meeting

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

Rob Wainwright was addressing MEPs in Brussels ahead of an emergency meeting on Friday of EU interior ministers on the Paris attacks.

Most of the Belgian raids are targeting properties in Jette and Molenbeek connected to Bilal Hadfi, a Frenchman living in Belgium who was one of the seven attackers killed in Paris, Belgian broadcaster RTBF reports.

A further raid, at an address in the Brussels district of Laeken, is linked to Salah Abdeslam - a suspected attacker who is believed to be on the run - Belgian authorities told the BBC.

However, the raids had been planned for some time and were not part of the manhunt, the prosecutor's office told Belgian media.