An explosion at a factory in northern France has left at least one person dead and injured two others. The blast at the Saipol factory, in Normandy coast fishing port of Dieppe, took place at around 11am this morning. A blaze has engulfed the entire complex and one worker is reported to still be missing. Four people were in the building at the time of the explosion - and nine others are being treated for shock. Firefighters remain at the scene and are battling the blaze. Footage shows huge plumes of black smoke and large flames were seen rising over the plant. City mayor, Nicolas Langlois, was on site at the end of the morning, and said: 'A security perimeter has been set up and local residents were asked not to leave their homes to take no risks.' The entire six-storey building is engulfed in flames but Mr Jumel confirmed the blaze was 'under control'. Photos from the scene show plumes of thick black smoke billowing into the sky. Emergency services remain on site including an air ambulance.