A man in his 80s was sent tumbling down an Asda escalator after a gang of teenagers pushed a trolley from the top.
The victim suffered head and hand injuries during the incident which happened at the supermarket in Imperial Retail Park, Gravesend, and went to hospital as a precaution.
The suspects are described as being aged between 12 and 16 years old and the attack happened between 6.20pm and 6.35pm on Friday, February 24.
One had brown hair and was wearing a grey puffer jacket, black tracksuit and black trainers. The other two had black hair and were wearing an all black tracksuit and an all red tracksuit.
Sgt Andrew Ferguson said: "The elderly victim is fortunate that he did not suffer more serious injuries and we have been trying to identify the teenage boys involved in this incident.
"There were other shoppers who will have seen what happened and we are appealing for witnesses, or anyone with information that may assist our enquiries, to call the appeal line."
Anyone with information should call 01474 366149, quoting reference 46/35856/23.
You can also contact Crimestoppers anonymously on 0800 555111 or by using the online form on their website.