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Kings Langley Fire StationResidents nearby are being warned to keep their doors and windows closed
Firefighters are tackling a blaze at a metal recycling centre on the outskirts of a village.
Hertfordshire Fire and Rescue said it was called to the fire at Railway Terrace, Kings Langley, near Hemel Hempstead, at about 03:10 BST.
The fire service is advising residents nearby to keep their windows shut.
Road closures are in place and are expected to last for some time, said Hertfordshire Police.
