Seventeen people, 12 of which were labourers working in the basement, were inside the building in Transport Nagar area in Sector 26 here at the time of the incident, police said.
According to fire brigade workers, the labourers had dug deeper than required due to which the roof of the liquor shop collapsed and six people were buried alive.
Two of the injured have been taken to Sector 32 hospital, one is admitted in Sector 16, while the others have been rushed to Postgraduate Institute of Medical Education and Research (PGIMER) in Chandigarh.
Nath also urged the Chandigarh administration to make strong policy to avoid such accidents in the future.
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Meanwhile, UT inspector general of police RP Upadhyay visited the accident site to take stock of the situation.
The fire brigade workers, police and members from NGO have managed in clearing the debris, police said.
A case has been registered against the contractor who was constructing the basement of the building, they added.