Scary to emergency land in RUS after recent events, yet no word on what problem is after hour surrounded by fire engines #VirginAtlantic
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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.