‘Can’t say for definite yet but we’re pretty sure accelerant was involved. Whoever poured it couldn’t have lit it from inside. Or if they did, we’ll be finding their body too.’ His phone buzzed and he checked the screen. ‘Excuse me. I need to take this.’ He clamped the phone to his ear. ‘Chapel.’

Around us, debris had been shovelled into huge piles for the council to remove. Strips of drenched, charred wood smelled bitter. Glass shards glinted threateningly in the light. Curtains and blinds had blown out into the street. Human traces were littered around the pavement: clothes, drink cans, food wrappers, a baseball hat, a couple of rucksacks, all drenched and abandoned.

Simon rang off. ‘That was the building inspector,’ he said to Dan and me. ‘He’s on his way. We aren’t sure whether the fire is completely out in the centre of the building. It’s still too hot to get in there. Our thermal imaging cameras can only reach so far.’ He gave me an apologetic smile. ‘I’ll call you the moment we get news or can get in.’

‘Thank you.’ I turned to Dan. ‘Let’s find out what witnesses we’ve got before they all clear off.’

We left the cordoned area and headed up the street to the phone repair shop where casualties had been ushered for treatment. When we arrived, the interior of the shop was a mass of people who’d been injured, display cabinets and product racks. A Sikh man was stretched out on his back on the floor with an oxygen mask over his face. Teenagers were huddled against the wall, looking pale and scared. Others were sitting on the floor, cuts and burns on their faces and arms. A lady with a blue-rinse hairdo was sitting on a plastic chair, clutching her arm, her entire demeanour one of shell-shock. Her hair was dishevelled and flecked with ash and dust, and she was clinging to her bag as though she was scared for her life. Beside the door, a paramedic was trying to attend to a lanky boy who had a large gash on his forehead. The young lad seemed unsteady on his feet and was muttering in Arabic.

Amidst the bodies, I spotted Dougie. As crime scene manager, his job was to talk me through the evidence and forensics. As soon as he saw us, he hurried over to the shop entrance. His large frame filled the doorway. He had a smear of blood on his cheek and ash had lodged in his hair and eyebrows, making his eyes seem greyer than usual.

‘Practising your First Aid?’ I smiled at him.