A post mortem examination is due to be carried out today on an 18-year-old woman who fell to her death from the 17th floor of a block of flats in Woolwich.
Scotland Yard says she fell after officers arrived at her flat to make an arrest.
The police watchdog, the Independent Police Complaints Commission, is investigating.
More top news
Corbyn was unveiling a poster less than a mile away as Khan gave his final campaign speech to party supporters in London.
Hay fever is an allergic reaction to airbourne pollen. There are 2 million sufferers in London (that's one in 5 people).
The man suffered head injuries after falling from Westminster Bridge and landing on concrete steps.