In addition to the problems out of Euston station, there are also problems at King's Cross. East Coast is advising customers out of King's Cross not to attempt to travel on its services north of Newcastle.
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Man who has barricaded himself in house for three days may have a stash of petrol and other explosives, police say.
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The Met Police has thanked residents in Northolt for their patience but has warned the armed stand-off could take time to resolve.