Boroondara Crime Investigation Unit detectives are investigating a theft at a retail store in Hawthorn on Friday afternoon (11 October).
Police have been told five unknown males entered the Glenferrie Road store about 4.20pm and stole a number of mobile phones on display before leaving.
The offenders are perceived to be of African appearance and were wearing black hooded tops and baseball caps.
A witness told police that she saw the offenders leaving the scene in a black VW Golf sedan.
Police are reviewing CCTV footage. No arrests have been made at this stage and the investigation remains ongoing.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or file a confidential report at www.crimestoppersvic.com.au