Maxim Shemetov/Reuters via CNN Newsource

By Chris Lau, Karina Tsui, Rhea Mogul

Hong Kong (CNN) — Hong Kong’s leader said he will ensure “justice is served” over the inferno that killed more than 150 people last week , as city officials point the finger of blame at construction companies for allegedly using substandard mesh netting to wrap scaffolding on the buildings.

Tuesday was the seventh day after the first deaths –– an important day in Chinese tradition as it’s believed to be when the soul of a deceased loved one returns to visit the family home. Hundreds of mourners made an emotional pilgrimage to the scene of the fire to mark the occasion by praying and laying flowers.

At least 15 people have been arrested over the blaze, which tore through seven high-rise apartment blocks

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