Authorities in Essex investigate a fire at a bus depot in Muckingford Road that destroys more than 30 double-decker buses. Reports say the blaze starts shortly before 7pm on Friday. The incident is described as being started deliberately, and police launch an arson investigation as a result. The fire spreads through the depot area and leads to extensive damage, with more than 30 vehicles reportedly destroyed. Emergency response details beyond the scale of the damage and the timing of the fire are not provided in the available reporting. No information is given here on injuries, the identity of the operator, or whether any suspects have been identified. Police continue inquiries into the circumstances of the fire and to determine the cause. The event is treated as deliberate based on initial assessment, prompting the arson investigation.