No one was injured in the incident on Friday afternoon, which involved a 322 sq ft section of roof at the Tesco Extra in Scunthorpe, North Lincolnshire.
The collapse happened at the furthest point from the main store entrance meaning shoppers had a lucky escape.
Emergency services attended and customers and staff were evacuated from the premises.
Commenting on the incident, a Tesco spokesperson said: “There was nobody in the immediate area. As a temporary precaution, we evacuated the store. We are working hard to fix the damaged section.”
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