The fire service spokesman said that one person had been taken to hospital as a precaution after the gas leak at the supermarket centre in Southampton.
It is understood that a total of 62 people had been seen by paramedics but their ailments are understood to be minor.
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Nearly 38,000 runners will hope to complete Sunday's London Marathon making it the biggest event in its 35-year history.
Rain across central Britain with longer, intense downpours with thunder in places this evening. A lucky few will stay sunny and dry.
Planning on going to the London Marathon tomorrow? Read our handy guide first!