Locals in the area could hear and see a police search Helicopter circling the area.
3:38pm Latest update Forensics arrived at the scene.
A general purpose Dog unit is being used.
Our reporter was at the scene and says the police cordon stretches from Beggars Bush Lane, Croxley Wharf by the two Bridges roundabouts and River Gade, to Blackmoor Lane in Croxley Business Park.
The police had corned off the area and on the other side at the Croxley business Park.
An Air Ambulance was see taking off at 13:58.
Hertfordshire Constabulary have said their enquiries are continuing and they asked anyone with information to call 101 quoting ISR 327 of 6 June.
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