Goals from Juan Mata, Emboaba Oscar, Frank Lampard and John Terry gave Chelsea a commanding victory over Brentford in their FA Cup 4th round replay this afternoon.
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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.