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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The singer had been tweeting in support of migrants when she was bombarded with abusive messages.
Ministers are reportedly considering plans in a bid to lower inward migration.
In a tweet on Saturday, the US president didn't give a reason for his absence but said he wished"everyone well and have a great evening".