The latest incident took place on Thursday night around 10.30 pm,local time, when the victims were on their way home, The Age reported.
Three to four persons approached the victims from behind demanding their wallets and cellphones, police were quoted as saying.
One of the victims, a 26-year-old student from Sunshine handed over his wallet and mobile phone and escaped from the spot, the report said.
While the other two students, aged 24 and 27 were thrashed by the offenders who also stole their cellphones.The 24-year-old man received head injuries from the attack and the 27-year-old man suffered soreness in his upper body, the report said.
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