A PhD student at The University of Western Australia discovered a severed pig’s head in the toilets at the university mosque.
In a post on his Facebook, Majdi Fal described his horror when he walked into the bathroom, which has a traditional Turkish toilet.
"The first feeling was the feeling of someone who's being threatened. I didn't expect to see that," Fal told ABC News.
"It's not because it was a pig's head - it can be anything, any other animal - it was the message that was clear."
"There clearly is motivation of these people trying to say you're not welcome here, or some similar message."
Having been shared over 500 times, people rushed to condemn the act.
The University of Australia's Student Guild also took to its Facebook to condemn the act.
A University of Western Australia spokesperson told BuzzFeed News the university was saddened by the "deplorable act."
"It is concerning that people using the UWA Muslim prayer room have been targeted in this way. The matter has been reported to police. We would like to reinforce that UWA strives to support a culturally inclusive and tolerant campus community and the University will offer help and support to our Muslim students at this time."