Three people, including a woman, and four gendarmes were killed as a gun-battle broke out in Sain-Denis, northern suburb of Paris during an anti-terrorist police operation on 18 November.
Seven people have also been arrested in the shootout.
Meanwhile, it has been presumed that Abdelhamid Abaaoud is one of those killed in the apartment, according to police sources.
The target of the attack was the suspected mastermind of Paris attacks, Belgian-national Abdelhamid Abaaoud, said a police source.
The source did not identify the casualties, but they included one woman detonated an explosive device, said police sources.
Meanwhile, French military forces have been deployed to north Paris as the shootout still continues. In this connection, two people have been arrested, police said.
Earlier, police said between two and four people were holed up in the apartment. It was not clear if Belgian Abdelhamid Abaaoud, 28, of Islamic State jihadist group was one of two to four people thought to be inside the apartment in Saint Denis that police swooped on.
In a sign of nervousness, a football match between Germany and the Netherlands was cancelled on 17 November. As police stepped up hunt for the fugitives, French and Russian jets pounded IS targets in the group’s Syrian stronghold of Raqqa for a third consecutive day.
The operation started at 04:31am local time. The area was closed down and gunfire could be heard an hour after it started. A special armed response unit took part in the raid.
On a solidarity visit to Paris, US Secretary of State John Kerry said a “big transition” in Syria was weeks away after Iran, Russia and Saudi Arabia reached a pact on a path towards elections.