Officers are appealing for witnesses and information following a serious assault which occurred in Hatfield.
The incident took place between 10am and 11am on Wednesday (4 October) on Hatfield Avenue.
The victim sustained a significant wound to his back from a machete in an underpass. Any further information as to how he received it is unknown.
PC Philip Jowett, from Welwyn Hatfield Local Crime Unit said: “I am appealing to anyone who was in any of the surrounding areas, namely Hatfield Avenue, Manor Road, Wellfield Road and Birchwood Avenue which all lead to the underpass and saw anything unusual to get in touch.
“If you saw anyone acting suspiciously, please contact me as you might hold vital information to assist with our investigation.
“I want to stress this is an isolated incident and the wider public are not at risk.”
Anyone with information can contact PC Jowett.
You can also report information online, speak to an operator in our Force Communications Room via our online web chat at or call the non-emergency number 101.
Alternatively, you can stay 100% anonymous by contacting the independent charity Crimestoppers on 0800 555 111 or via their untraceable online form (opens in a new window).