A senior French police official says the large police operation targeted the suspected mastermind of last week's attacks, Abdelhamid Abaaoud.
Earlier, at least seven explosions were heard at the scene.
The official, who was not authorised to be publicly named according to police rules but is informed routinely about the operation, says that scores of police who stormed the building early Wednesday (French time) were met with unexpectedly violent resistance.
Reinforcements were summoned and several people were injured.
Authorities in the Paris suburb of Saint-Denis have evacuated about 20 residents from the building.
A city official said the residents were brought to city hall for protection.
The site is less than 2 kilometers from the Stade de France national stadium. Three suicide bombers blew themselves up Friday near the stadium during an international soccer match with French President Francois Hollande in attendance.
- AP
- nzherald.co.nz