According to reports, the Citroën C4 Picasso contains gas bottles and bags and is parked about 200 metres from the city's Christmas market.
The area where the police operation is taking place has been evacuated, according to the La Voix du Nord media outlet.
According to reports, the sappers opened the car and removed two small and large gas cylinders, battery cables, minor construction equipment and a suitcase containing cables.
The owner stated that he did not know why the equipment was there.