Delay at scene before it is handed over to SOC
Some scenes of crime officers (SOCO) arrived at the scene at just after 9 O'clock, whilst DI Cook, and PC Bird, arrived at 9:20am - they were prevented from taking control of the scene upon arrival, because mystery men were performing certain duties inside the building involving the bodies of the five victims...
SOC did not get control of the scene until 10 O'clock, onwards, and even after this for an hour between 10:35am and 11:35am, that control was interrupted by another group of mystery men, who engaged the bodies of the deceased (whilst in situ) in some sort of exercise...