Victoria Police has defended the actions of protective services officers filmed pinning down a teenager, reported to have had a broken ankle at the time.
The 16-year-old was arrested at Bayswater train station in Melbourne's east early on Sunday on suspicion of criminal damage, and after he provided a fake name tried to run away, police said.
Pictures uploaded to social media show the boy with a snapped ankle, while in video footage, a bystander could be heard screaming: "He's got a broken ankle, he's not resisting," at officers pinning down the struggling teen.
A Facebook group called Victoria Police Corruption posted the footage on Wednesday, alongside quotes said to be from the unnamed father of the boy.
"This is my 16-year-old son. Saturday night these pso officers told him he was under arrest, wouldn't give a reason and and didn't believe who he said he was," the man was quoted as saying.
"So a kid tells them to f*** off and he ends up in hostpital (sic) with a foot so smashed up from them stomping on it that.
"I want these pieces of shit named and shamed until something is done."
Victoria Police said while some people might find the footage confronting, "it only provides a small part of the whole incident".
The teenager was not charged and is assisting with police inquiries.
AAP has contacted the Facebook group for comment.