Police are trying to track down a man who repeatedly smashed a Multanova against a Swanbourne lamp post on December 30.



Police Media's Ros Weatherall said the vandalism occurred about 4.50pm.



The alleged offender tries to wrench the Multanova from its mounting.

"One of our camera operators was monitoring northbound traffic on the West Coast Highway adjacent to Swansea street in Swanbourne," Ms Weatherall said.



"He's seen a man standing nearby at a bus stop paying attention to the Multanova and kept an eye on him because he appeared suspicious.