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

French police presence in Paris. (AP Photo/Frank Augstein)

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

Police have blocked off the area around Place Jean Jaures 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 7 terrorists.

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

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