Woman sexually assaulted during brutal Brisbane bashing.

By Louisa Rebgetz.

A Polish woman was sexually assaulted during a brutal random bashing in Brisbane, Queensland police have revealed while renewing their call for witnesses to come forward.

The 24-year-old was walking on the footpath at Petrie about 9:00pm on November 25 when she was attacked in a carpark.

She suffered facial injuries, including a broken nose, in the attack and had to undergo surgery.

Detective senior constable Clinton Olsson said police had been keeping the fact she was sexually assaulted private out of respect for her, but she had now returned to Poland.

“It was of a sexual nature and it was a serious category of that,” he said.

“It was a very horrific attack.”

He said the woman seemed to be in “good spirits” and continued to communicate with officers.

Three witnesses crucial to investigation

CCTV footage was released on Tuesday and detectives want to speak to three people in the footage who they have not been able to contact.

They are a man riding a bike with a dog, a woman wearing a black top and carrying a black bag and another person riding a motorbike.

Senior constable Olsson said they were persons of interest, not suspects, who might be able to provide crucial information.

"Obviously we need to speak to those three people first to rule out any involvement," he said.

Forensic testing is still being conducted on a belt buckle found at the scene.

Senior constable Olsson is urging anyone who knows anything about the belt buckle, which has a cross and religious star on it, to come forward.

This post originally appeared on ABC News.