An air ambulance was deployed as paramedics rushed to the aid of a woman.
The East of England ambulance service says it was called on Sunday, March 14, to attend to a woman suffering a medical emergency in Dunny Lane, Kings Langley.
One ambulance, two ambulance officer vehicles, a rapid response vehicle and the Essex and Herts Air Ambulance was sent around 4pm.
A patient was transported to St Mary's Hospital for further assessment and care.
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