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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A cloudy start to the day with top temperatures of 18C (64F).
Immigration levels may need to rise, David Davis has said as he refused to commit to a cap on the number of EU citizens coming to the UK.
MSPs are expected to back Nicola Sturgeon's call for a second independence referendum in a vote at Holyrood on Tuesday.