An official says a large police operation is under way in the Paris suburb of St-Denis and it’s believed to be linked to the deadly attacks on the French capital.

The police official says there have been exchanges of gunfire and special SWAT teams are on the scene. The official was not authorised to be publicly named, according to police policy.

Police have blocked off the area around Place Jean Jaurès in Saint Denis, just north of Paris.

French authorities have said they are searching for at least two people involved in last Friday’s attacks, which killed at least 129 people and seven terrorists.

Ambulances can be seen and sirens heard in French television footage from the scene.

Residents in St Denis have reportedly been told to stay inside their homes and away from the windows.

Reports say automatic gunfire has been heard, along with possible explosions.

A police helicopter is also overhead, with the central location apparently place Jean Jaurès, close to the St Denis basilica. (Guardian)