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Knife-wielding robbers forced three teenage boys to hand over mobile phones, air pods, keys, bankcards and bus passes.
Police are appealing for information following the robbery which is reported to have happened shortly before 10pm on Saturday, May 18 on the stairs by Greenhithe Railway Station in Station Road.
The boys were not injured in the incident.
One suspect is described as being a black male, around 5ft 8ins tall and of large build. He was wearing a black balaclava and a tracksuit.
He was accompanied by two other males, who were described as being white, around 5ft 10ins to 6ft and wearing similar tracksuits.
Inquiries are ongoing and police are keen to hear from anyone who witnessed the incident or may have information that would help officers.
Witnesses or anyone with information should call 01474 366149 quoting crime reference 46/95135/19 or Crimestoppers anonymously on 0800 555111.
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