CCTV has been released after a worker was pushed down the escalator of a Dymocks bookstore in the Melbourne CBD in a violent attack believed to have been sparked by vaccine mandates.
The assault is among a spate of recent attacks on retail workers checking customer vaccine certificates in the city.
Police were told a man attended the Collins Street bookshop about 12.20pm on November 26, when a fight erupted between him and a worker who asked to see his vaccination certificate.
"A staff member approached the man to check compliance with conditions of entry," a police statement said.
"There was a disagreement between the two which escalated and resulted in the man pushing the staff member in the chest and causing him to fall down an escalator.
"The offender then left the scene."
A Current Affair last week revealed shocking footage of raging customers, which included the man knocking the bookseller out cold by pushing him onto the moving escalator.
Two other Dymocks workers were attacked on the same day.
One worker was slapped by an older woman, while another was lunged at by a "well-dressed middle-aged man".
Melissa Traverso, owner of the Dymocks franchise in Melbourne's CBD, said she has never seen such violence in the two decades since she opened her store.
"To have three physical attacks on innocent booksellers just doing their job is a very bad day," she told ACA.
"Who would have thought that working in a bookshop as a bookseller would be a dangerous occupation."
Police have released a CCTV image of a man they are searching for in relation to the escalator assault who may be able to assist with their enquiries.
He is perceived to be Caucasian with light blonde facial hair.
"At the time of the incident, he was wearing a rainbow-coloured hoodie with black pants and runners," Senior Constable Adam West said.
The worker was treated by ambulance crews at the scene.
Anyone who recognises the man or with further information is urged to contact Crime Stoppers on 1800 333 000.