Without any evidence, the newspapers assumed arson ("incendiarists"), perhaps thinking of a disgruntled ex-employee, as Gay had sacked some of his work-force in response to the economic downturn of a year before, and those remaining were on short hours.
At the inquest it transpired that there was a hole, accessible from the Sturt Stables, in the wall of the flockroom, adjacent to Gay's engine (gas driven) room.
Flock and kapoc, natural fibres used for stuffing mattresses and upholstery, are both somewhat flammable, and could conceivably be ignited by someone of malicious intent.
All witnesses insisted Gay maintained good relations with all employees, past and present, and there was no enmity between his English and German workmen, who were on equal pay rates.
The inquest failed to decide on a probable cause, and Gay was able to claim from the insurance companies.