Police are investigating a series of gunshots fired into a luxury sports car business in Richmond – a business linked to complaints about taking big security deposits from customers and failing to return them.

A Victoria Police spokeswoman said it was believed several rounds of shots were fired into Dream Drives Melbourne in Burnley Street about 11.30pm on Friday.

A man armed with a knife has threatened a female postal worker in Kingston at lunch time on Monday. Credit:Marina Neil/Fairfax Media

It is believed about nine bullets were shot into the front window of the business.

The spokeswoman said evidence of the shooting was noticed by a passer-by who alerted police about 8.30am on Saturday.

No injuries were reported in the shooting. Police said the investigation was ongoing.

A man purporting to be the solicitor Dream Drives told Fairfax Media the Melbourne branch was not linked to the complaints about the security deposits.