Manningham Crime Investigation Unit detectives are investigating after two 13-year-old boys were injured and had their electric motorcycles stolen in Doncaster East earlier this week.
Investigators have been told the pair were riding along Koonung Creek Trail when they were approached by two unknown males shortly after 5pm on Monday 10 November.
The offenders assaulted one of the boys and stole his motorcycle.
He fled on foot and received minor injuries that did not requirement medical treatment.
The second boy fled on his motorcycle before crashing into a wall and sustaining serious injuries near the Blackburn Road underpass.
The offenders caught up with the victim, failing to render assistance, and stole his motorcycle.
The offenders fled on both motorcycles, east along the trail.
The first offender is described as Caucasian, approximately 15 years old, 165cm tall and was wearing a black ski mask, black hooded jumper and black trackpants.
The second offender is described as Caucasian, approximately 15 years old, 165cm tall with black hair and was wearing a black ski mask, multi-coloured BAPE hooded jumper and black trackpants.
Investigators have released an image of the motorcycles stolen in the hope anyone who was in the area at the time recognises them and can come forward with information.
Anyone who witnessed the incident, has dashcam or CCTV, or anyone with information to contact Crime Stoppers on 1800 333 000 or submit an online confidential report at www.crimestoppersvic.com.au.