Local politician and former mayor of Dieppe Sebastien Jumel confirmed the death of one person, adding that another is missing and several people are in shock, as cited by France Bleu.
The blast took place around 10:30 am local time during routine maintenance at one of the factory's silos, Paris-Normandie reports. The two workers are reportedly subcontractors employed by Saipol. The main six-storey building in the complex was engulfed in flames but the blaze has been brought under control.
The plant reportedly refines crude oil for use in the manufacture of biodiesel, and employs a total of 40 people. The cause of the explosion is still unknown.