10:49 am, Tue 29 Jan 2013
A London Ambulance Service spokesman said:
"We were called at 8.39am today to reports of a patient taken unwell at London Bridge station.
"We sent two ambulance crews, a single responder in a car, our hazardous area response team and a duty manager.
"Our staff have assessed four patients at the scene who were taken unwell. Three of the patients have been taken to hospital."
10:41 am, Tue 29 Jan 2013
Twitter user Helen True shared this photograph of emergency services attending London Bridge station where four people were taken ill.
Helen True took this picture from the offices of the Mental Health Foundation.
Network Rail and TfL dismissed reports of a gas leak and said that overground and underground train services were running as normal.
10:36 am, Tue 29 Jan 2013
Network Rail told ITV News that there is no gas leak at London Bridge station and that train services are running as normal.
They added that four people were taken ill but the incidents were not related to each other.
10:34 am, Tue 29 Jan 2013
London Fire Brigade have said they were called by the Met Police to London Bridge after at least three people were taken ill at the train station this morning:
Read more: Metropolitan Police say there is "nothing to link the cases at this stage"
10:33 am, Tue 29 Jan 2013
Transport for London (TfL) told ITV News that the issue was in the Network Rail part of London Bridge station and that underground services were running as normal.
10:22 am, Tue 29 Jan 2013
At least three people were taken ill at London Bridge station this morning, but the Metropolitan Police said there was nothing to link the cases at this stage.