Four teenage boys have been charged after allegedly swarming electronics stores across Melbourne and running off with stolen mobile phones in a crime spree spanning weeks.

The boys, aged 14 to 16, were arrested on Friday after stores in Thomastown, Sunshine, Airport West, Prahran, Brunswick and Altona North were robbed between June 21 and last Tuesday.

Police allege the boys swarmed into the electronics and telecommunications stores and grabbed products, mostly mobile phones, and ran from the stores.

Police searched three homes in Point Cook, Tarneit and Truganina in the western suburbs on Friday and found allegedly stolen electronic devices.

The four boys - aged 16, 15, and two aged 14 years - have since been charged with more than 16 offences each. They are expected to appear at a children's court at a later date.

A special taskforce will be set up this week to target swarming offences. Commander Tim Hansen has been appointed to oversee Taskforce Liega.

"We recognise that this type of offending creates fear in the community and risks the safety of the employees," he said in a statement on Sunday.

"Taskforce Liega will assist us in identifying offending patterns and deploying detectives earlier so as to ensure a quicker apprehension of the offenders."