Police are appealing for a man who is believed to have seen offenders involved in an attempted robbery at a One Stop Shop in Cheshunt to contact them.
On November 3 at around 5.40am two members of staff were opening the shop in Newnham Parade when three offenders approached him and forced him inside.
The suspects then left without taking anything in the direction of College Road and the A10.
No one was injured during the incident.
The offenders are described as males who were all wearing dark clothing. One had a JD sports bag on his back.
Detective Constable Sarah Hopkins is investigating and said: â€œA man approached the shop just after the offenders had left and checked that the staff were ok. At this time they had locked the door and were understandably cautious about letting anyone else in.
The man said he would return later, but didnâ€™t and therefore the staff do not have any details for him. He may be a key witness and I would ask if this was you to please contact me straight away.
â€œI would also like to hear from anyone else who was in the area around this time and can assist at all with my investigations to please contact me.â€
Anyone with information is asked to contact DC Hopkins at Hoddesdon police station via the Herts Police non-emergency number 101 quoting crime reference number K2/14/378. Alternatively contact Crimestoppers anonymously on 0800 555 111.