"This morning [I am with] residents of [an area near] Porte de la Chapelle [metro station]. 1,600 people were evacuated from the area because a WWII bomb is being deactivated", the mayor wrote on her Twitter page.
She added that the evacuation was being carried out with the participation of municipal services.
The bomb was found on 4 February during engineering works but experts have failed to neutralise it so far, according to media reports.
The demining operation has reportedly caused significant transport disruption near the Gare du Nord railway station.
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Even almost 75 years after the end of the war, unexploded WWII bombs are often found across Europe.