A 19-year-old man is in a critical condition in hospital after being stabbed in New Cross.
Police say it happened on New Cross Road, near the junction with Clifton Rise, at around 3:30am.
Police say it is not connected to the earlier stabbing of a 14-year-old boy in Lee.
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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.