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29 January 2013, 11:37 | Updated: 29 January 2013, 11:41
Four people have been taken ill at London Bridge station.
Three people were taken to hospital and London Ambulance Service say it was not not chemical related.
The London Fire Brigade believes the four cases were not linked
Part of the station was closed but quickly reopened.
At least 40 emergency service vehicles were called.
Met police say the huge response from the emergency services was because so many people called 999 all at once.