A postmortem will held today on a 19-year-old man who was shot dead in Clapton on Saturday.
A second man was also hurt in the attack but is in a stable condition.
No arrests have yet been made and the police are appealing for any information.
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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.