Police have carried out a series of raids, ahead of this weekend's Notting Hill Carnival, in an attempt to combat potential trouble makers. One hundred and twelve people have been arrested for offences including robbery, theft and drugs possession.
Officers have also seized several firearms, £4, 000 in cash and a Porshe. The focus has been to target gangs and other criminals intent on causing trouble at the carnival.
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The 24-year-old was unarmed and the incident is not being treated as terror-related.
Some platforms have been taken out of service with disruption expected to continue until the end of the day.
The Met Office has extended its weather warnings for snow and ice to cover vast swathes of the country, including London and the South East.