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A Tesco superstore had to close after an unusual smell was identified as a chemical issue.
The Ruxley branch at Sidcup was closed on Wednesday as a precaution.
Fire crews attended and put it down to a "chemical issue".
The store reopened on Wednesday evening.
A Tesco spokesman said: "We’re pleased to confirm our Sidcup superstore is open as usual after a brief closure on Wednesday night and we apologise for any inconvenience caused by the closure at the time."