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
Stars will entertain an audience of more than 100 million as they take to the Super Bowl half-time stage.
Jeremy Hunt is to announce a £4.2 billion investment to bring the NHS into the digital age.
Figures from the Local Government Association show 60,000 households will be affected by plans to end subsidised rents for high-earners.