Police expect to lay charges tomorrow in relation to the fire and explosion at a western Sydney convenience shop this morning.
Investigators have spent the day scouring the rubble of the two-storey shop and apartment on Station Street in Wentworthville that exploded around 4:00am (AEDT) today.
Eight police officers suffered minor burn and smoke inhalation injuries while rescuing two men from the burning shop.
A police source has told the ABC they have a very strong lead in the investigation and expect to lay charges over the incident tomorrow.
Two men believed to be tenants of the shop suffered broken bones and serious burn injuries.
Locals have described the building as an Afghan supermarket with an apartment on top, while fire crews say it was a $2 shop.
Video posted on social media shows the building burning fiercely as screams are heard above the sound of flames.
Witness Katie Facaris saw a man who was stuck under burning bricks.
"He was yelling, 'Help, get me water'," she said.
Another witness, Ethan Roberts, said police "just came from everywhere" after the explosion.
"There was another guy who was stuck in the fire, with all the bricks on top of him," he said.
"There was another guy telling him that the guy in the bricks is just going to have to wait until the fire crews get there.
"Then police just came from everywhere. There were probably about seven police officers that were going to get him out but they couldn't because of the heat. It was just so hot."
The supermarket was next door to the Wentworthville Hotel, which was evacuated but did not catch fire.
It is not clear if the explosion caused the fire, or if the fire caused the explosion.