But when Hampshire Fire and Rescue Service's rescue team gained entry to the flat, above Carpet Services in Waterlooville at 12pm today, there was nobody inside.
A spokeswoman for the fire service said: '˜Police called us because they had a reason to believe someone was locked inside the building, there was a concern for welfare.
'˜We gained entry for officers but there was no-one inside so we handed the incident back over to police.'
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The shop is on London Road in Waterlooville's town centre.
Hampshire police have been contacted about the incident.