The fire last week, which took two days to extinguish, started in the safety nets on the lower floors of one of the seven fire-ravaged buildings.
After testing the networks, several errors have been discovered – suggesting that those responsible for the renovation have skimped on profits, according to Eric Chan, Hong Kong's Chief Secretary for Administration.
"They just wanted to make money at the expense of people's lives," he said, according to the AP news agency on Monday.
So far, 151 people have been confirmed dead, but police do not rule out that the number could rise further. More than 100 people are still missing, reports the South China Morning Post.
Since the fire was extinguished on Friday, several hundred identification specialists have gone door to door in the burned-out buildings to search for remains.
During the search operation, bodies have been found in corridors, apartments, staircases, even on roofs, operation leader Cheng Ka-Chun told CNN.
13 people have been arrested, suspected of various types of crimes in connection with the fire.
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