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.
More top news
Heavy rain - mostly across Wales - will clear eastwards throughout the day tomorrow
A former coach and kit man at Scottish football clubs has been charged with sexual activity with a child.
An eight-year-old girl has been taken to hospital after she was reportedly stabbed in Edinburgh.