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- Police cars have surrounded the entrance to Watford Junction this afternoon (February 6) starting from around 3pm to 3.30pm.
- A helicopter has reportedly landed at Radlett Road Playing Fields.
- Ambulances are also at the scene.
- Herts Police said they were at the scene of an "ongoing medical episode".
- Officers are there to help clear the area for the air ambulance to land.
- British Transport Police are now leading the operation. The police presence has been, at least largely, stood down by 5pm.
- The East of England Ambulance Service and British Transport Police have been contacted for more information.
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