Network Rail and TfL have dismissed reports of a gas leak and said that overground and underground train services are running as normal.
Although four people have been taken unwell at London Bridge Station this morning, the Metropolitan Police has said there was nothing to link the cases at this stage.
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Before the final declaration on Friday, the Conservative candidate looked set to lose the City Hall race to Labour's Sadiq Khan.
The Tooting MP has been the frontrunner in the counting process ahead of Tory challenger Zac Goldsmith.
It's not just London where elections have been taking place today. There were council elections taking place across the home counties.