Fire brigades, using detection equipment, recorded a high level of gas in the atmosphere. About 1,450 people were evacuated from a nearby nightclub and a hotel, the service said on its website.
Earlier, London police reported that in connection with a gas leak on Strand Street, authorities had evacuated some of the commercial organizations and hotels in the Westminster area "as a precaution."
The fire service notes that the railway station Charing Cross was also closed as a precautionary measure.
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