Southern Metro Regional Crime Squad detectives have charged two teenagers in relation to an alleged aggravated carjacking at a shopping centre in Narre Warren on 17 March.
It is alleged a 54-year-old woman was returning to her vehicle with her shopping when she was approached by two males about 9.25pm.
One of the males allegedly demanded her car keys, before the victim attempted to run away.
She was allegedly blocked by the same offender, who produced a knife and made a second demand for the keys.
She handed over her car keys and the offenders allowed her to leave.
The offenders were unsuccessful starting the vehicle before they fled the scene after being disturbed by witnesses.
A 15-year-old Doveton boy and an 18-year-old Hampton East male were arrested yesterday.
Detectives executed a warrant at a Hampton East address and seized an imitation firearm.
The 15-year-old boy has been charged with aggravated carjacking and will appear at a children's court at a later date.
The 18-year-old male was charged with aggravated carjacking and possessing an imitation firearm.
He will face Melbourne Magistrates' Court on 17 July.
