Dandenong Criminal Investigation Unit detectives are investigating a series of robberies that occurred in the vicinity of Dandenong and Noble Park Railway Stations overnight, Victoria Police say.
The first incident occurred about 7.50pm, a man was walking along Foster Street Dandenong when he was approached by six males.
He was assaulted, had his wallet stolen and left with a large gash to the side of his head.
The second incident occurred 10 minutes later in the same area, a man was approached by six males who demanded his wallet before assaulting him and stealing his mobile phone.
The third incident was in James Street Springvale about 8.10pm, a man was approached by 5-6 males and one of them produced a box cutter.
He was assaulted and his wallet and mobile phone were stolen.
The fourth incident occurred in Joy Street, Noble Park about 11.25pm, a man was approached by two males that knocked him to the ground.
He was held down, assaulted and his wallet was stolen.
All the alleged offenders were perceived to be of African appearance.
No one was seriously injured during the incidents and investigators believe the incidents may be linked.
Anyone with any information is urged to contact Crime Stoppers.