The Isis militant group could arm itself with biological and chemical weapons in future terror attacks on Europe, the French prime minister has warned.

Manuel Valls said France faced a serious threat from associates linked to the gunmen and bombers who launched attacks across Paris last Friday, killing 129.

"We must not rule anything out," he said. "I say it with all the precautions needed. But we know and bear in mind that there is also a risk of chemical or bacteriological weapons."

Mr Valls presented a bill to the French parliament that would extend the country's state of emergency for another three months. It will then go to the upper house on Friday.

He said: "Terrorism hit France, not because of what it is doing in Iraq and Syria ... but for what it is."

Meanwhile, the French Interior Ministry and Paris prosecutor's office said it remains unclear whether the suspected mastermind of last week's Paris attacks was killed in a raid on Wednesday or is still at large.

Officials said authorities are working on determining whether 27-year-old Belgian Abdelhamid Abaaoud was among those killed in a chaotic and bloody raid on an apartment in the Paris suburb of Saint-Denis, which left two dead and seven in custody.

What do we know about the Paris attackers?

Police launched the operation after receiving information from tapped phone calls, surveillance and tip-offs suggesting Abaaoud was holed up there.

In pictures: Saint-Denis raid Show all 33 1 /33 In pictures: Saint-Denis raid In pictures: Saint-Denis raid A man is arrested by police officers at the site where a raid happened in the city center of Saint-Denis, near Paris In pictures: Saint-Denis raid Hooded police officers detain a man in Saint-Denis, near Paris In pictures: Saint-Denis raid Hooded police officers detain a man in Saint-Denis, near Paris In pictures: Saint-Denis raid Police officers detain a man on the ground inside a shopping mall in Saint-Denis In pictures: Saint-Denis raid Police officers arrest a man in Saint-Denis, a northern suburb of Paris In pictures: Saint-Denis raid French police officers storm a church after a raid in Paris suburb Saint-Denis In pictures: Saint-Denis raid Police officers at work at the site where a raid happened in the city center of Saint-Denis In pictures: Saint-Denis raid Some people are being transferred to a local hospital near the site of this morning police raid in Saint-Denis In pictures: Saint-Denis raid Residents are evacuated in Saint-Denis In pictures: Saint-Denis raid Inhabitants are evacuated from a security perimeter set in the northern Paris suburb of Saint-Denis city center In pictures: Saint-Denis raid Families are evacuated by police members at the site were a police raid happened in the city center of Saint-Denis In pictures: Saint-Denis raid Rescue teams take care of an injured police officer at the site where a police raid happened in the city center of Saint-Denis In pictures: Saint-Denis raid Members of special French RAID forces with a police dog and French riot police (CRS) secure the area during an operation in Saint-Denis In pictures: Saint-Denis raid Police forces operate in Saint-Denis, a northern suburb of Paris In pictures: Saint-Denis raid French riot police (CRS), soldiers, firefighters and health workers stand at the scene in Saint-Denis In pictures: Saint-Denis raid French riot police (CRS) secure the area as shots are exchanged in Saint-Denis Reuters In pictures: Saint-Denis raid Rescue teams and police gather at the site where raid happened in the city center of Saint-Denis In pictures: Saint-Denis raid Soldiers operate in Saint-Denis, a northern suburb of Paris AP In pictures: Saint-Denis raid Police officers take up positions in Saint-Denis, a northern suburb of Paris AP In pictures: Saint-Denis raid Police and Ambulance vans are parked in Saint-Denis, a northern suburb of Paris AP In pictures: Saint-Denis raid A resident is being searched by police officers in Paris suburb Saint-Denis AP In pictures: Saint-Denis raid Members of French police special forces in the northern Paris suburb of Saint-Denis city center, as French Police special forces raid an appartment, hunting those behind the attacks that claimed 129 lives in the French capital In pictures: Saint-Denis raid Anti-terrorist police raid apartment in Saint Denis, Paris. Reports suggest the target of the police siege in Saint-Denis is Abdelhamid Abaaoud, thought to be the mastermind behind the Paris attacks. Three suspected terrorists have barricaded themselves in an apartment gunfire has been exchanged between the men and dozens of armed police Rex In pictures: Saint-Denis raid French special police forces secure the area as shots are exchanged in Saint-Denis Reuters In pictures: Saint-Denis raid French police evacuate residents in Saint-Denis Reuters In pictures: Saint-Denis raid Police officers take up positions in Saint-Denis, a northern suburb of Paris AP In pictures: Saint-Denis raid Police forces prepare in Saint-Denis, a northern suburb of Paris AP In pictures: Saint-Denis raid French spolice stop and search a local resident as shots are exchanged in Saint-Denis In pictures: Saint-Denis raid French police members participate in an raid in the city center of Saint-Denis EPA In pictures: Saint-Denis raid French special police forces secure the area as shots are exchanged in Saint-Denis Reuters In pictures: Saint-Denis raid Firemen wait for the develop of the operation in the city center of Saint-Denis EPA In pictures: Saint-Denis raid French police secure the area as shots are exchanged in Saint-Denis Reuters In pictures: Saint-Denis raid French special police forces secure the area as shots are exchanged in Saint-Denis Reuters

Paris prosecutor Francois Molins said the identities of the dead - including a female suicide bomber - are still being investigated, but that neither Abaaoud nor another fugitive, Salah Abdeslam, is in custody.