An eagle-eyed member of the public has alerted police to a group of men allegedly breaking into vehicles in Clayton overnight.
The witness was driving along Princes Highway when she spotted four men inside a car yard at the intersection of Clayton Road just after midnight.
She called Triple 0 and kept the men under observation until police arrived and arrested them without incident.
Three men, a 17-year-old from Boronia, a 23-year-old from Ringwood and a 28-year-old from Dandenong, are all expected to be charged on summons with attempted theft of motor vehicle, tamper with motor vehicle, criminal damage and going equipped to steal.
A 25-year-old Dandenong man was bailed for outstanding warrants and is expected to be change in relation to the incident at a later date.