Hobsons Bay Crime Investigation Unit detectives have charged a fifth person following a serious assault in Altona Meadows on 19 July.
It is alleged a man was approached by a group of males and pushed to the ground at a shopping centre on Central Avenue, about 8pm on Saturday 19 July.
One of the males allegedly produced an edged weapon and struck the victim's forearm, causing a serious injury.
The victim, a 33-year-old Altona Meadows man, was transported to hospital with serious but non-life-threatening injuries.
Investigators arrested four teens on 21 July in relation to the incident.
14-year-old boy from the Wyndham area was charged with intentionally cause serious injury, reckless cause injury, robbery and unlawful assault.
Two 15-year-old boys from the Hobsons Bay area were also charged with intentionally cause serious injury, reckless cause injury, robbery and unlawful assault.
A 14-year-old boy from the Hobsons Bay area is expected to be charged on summons.
Investigators arrested a 15-year-old boy from the Hobsons Bay area yesterday.
He was subsequently charged with robbery and other offences.
He has been bailed to appear at a Children's Court at a later date.
Police are not looking for anyone else in relation to the matter.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit an online confidential report at www.crimestoppersvic.com.au.
