A man who suffered a fractured skull when violence broke out in the early hours of Christmas Day is still being treated in hospital.
Police say the 34-year-old is in a stable condition at Watford General Hospital.
It is believed that a row broke out between two men at around 2.40am in the stairwell of a block of flats in Hilltop Road, Berkhamsted.
Officers are still appealing for the public’s help to trace any items that many be connected to the incident.
Det Insp Justine Jenkins said: “We believe there may be clothing and implements used in the incident that still need to be traced.”
Anyone with information about the incident, or who finds any suspicious items in the area, should contact police on the non-emergency number 101.