More than 100 firefighters are working to bring a massive fire under control at an industrial unit in Essex. Authorities have declared the incident as a "significant incident," meaning emergency services are coordinating a large-scale response. Fire crews from multiple stations have been deployed to the scene, where flames and smoke are visible from a distance. No injuries have been reported so far, but officials are urging people to avoid the area. The cause of the fire is not yet known, and an investigation is expected to begin once the blaze is extinguished. The fire service has not provided details about the type of industrial unit or the materials involved. Residents nearby have been advised to keep windows and doors closed due to smoke. Firefighters are using specialist equipment to tackle the flames, including aerial ladder platforms. The operation is ongoing, and updates will be provided as more information becomes available.