Five masked robbers left a man needing hospital treatment after they raided a property in Christmas week.
The group of men forced entry to an address on High Street in Colney Heath at around 9.15pm on Monday, December 18.
Three of them were carrying knives and another had what could have been a gun inside a sock, although the actual weapon was not seen.
A man and woman were at the house at the time and the man was wounded on his chest and hand and had to be taken to hospital.
Items of personal property were stolen during the incident.
Det Con Ben McGregor said: “Understandably, this was a frightening ordeal for the victims and we are doing all we can to trace those responsible. At this time, it is believed to have been an isolated incident.
“I am appealing for anyone who recognises the people in the video to please get in touch with us as soon as possible.”
Anyone who recognises the people in the video, or has information about the incident, is asked to contact police on 101, quoting crime reference F3/17/2779.
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