Victoria Police says it is "extremely disappointed" after an officer involved in responding to climate protests was photographed wearing a sticker with a lewd slogan on his body camera.

It comes as an anti-mining protester is considering her legal options after mobile phone footage appeared to show a Victoria Police officer hitting her in the jaw.

Key points: Victoria Police said the officer's actions were extremely disappointing and he could be disciplined

Victoria Police said the officer's actions were extremely disappointing and he could be disciplined The police released a statement saying they were trying to work out how the message ended up on the officer's camera

The police released a statement saying they were trying to work out how the message ended up on the officer's camera In a separate incident, a protester says she is weighing up her options after video footage appeared to show her being hit in the jaw

Both incidents have fuelled debate over the actions of police at the protests in Melbourne this week.

The unidentified officer wearing the EAD hippy sticker on his body camera. ( Twitter: @BenjaminMillar )

Police say they acted lawfully in responding to the protesters who were endangering themselves and others.

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In a statement, Victoria Police confirmed the image of the officer with the sticker, displaying the words "EAD hippy", is genuine.

The letters EAD are commonly used to stand for "eat a dick".

The sticker did not obstruct the lens of the camera.

A Victoria Police statement said the officer had been identified and would be investigated.

"We are still working to ascertain how and why this comment was on his camera," the statement said.

"The community can be reassured this is not the type of behaviour we expect from our officers and we are extremely disappointed by the situation.

"This behaviour detracts from what was otherwise a professionally conducted operation and tarnishes the reputation of all of our officers.

"Victoria Police will be investigating the matter further with involvement from Professional Standards Command and disciplinary action will be considered as part of this."

The Police Association said the incident was a distraction from the good work done by officers.

"We are disappointed that such a silly and inappropriate comment has distracted from the essential work that our members undertook during a prolonged and frustrating protest to safeguard people attending," a spokesman said.

Police defend 'palm strike' on protester

Police have otherwise defended officers involved in responding to the protests, including one who was filmed hitting an activist with a "palm strike" — a technique used to move on protesters and to prevent them from being able to assault an officer.

"This is a commonly applied clearance move in dynamic public order scenarios which is designed to create distance from police … so that both police and protesters can be protected from further violence," a spokeswoman said in a statement.

The protester, who gave her name as Kiki, said she did not know why she was targeted.

"I had a police officer coward punch me in the jaw, unprovoked," Kiki told a media conference held by the protesters.

"I'm a five foot five, 49-kilogram woman."

The woman said her jaw was still sore and she had since spoken with Melbourne Activist Legal Support about the incident.

"I'm quite lucky it didn't make as much contact as it could have," she said.

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Watch Duration: 28 seconds 28 s WARNING: OFFENSIVE LANGUAGE The video appears to show an officer striking a protester in the head.

Scuffles regularly broke out this week as protesters tried to stop delegates from entering the conference centre, yelling at them "blood on your hands" and "climate criminals".

Dozens of protesters were arrested and two were charged with animal cruelty offences for allegedly slapping a police horse.

Kiki said she was not arrested at any time during the week.

Kiki said she was weighing up her legal options. ( ABC News: James Oaten )

Police deployed pepper spray to subdue crowds and used horses to force back the mob and create a buffer between them and the building.

In one incident, a woman was seen being pepper sprayed after she climbed up the convention centre to hang an anti-mining banner.

Violence broke out at the blockade on two of the four days of the conference. ( AAP: James Ross )

A Chilean woman, who introduced herself as Camila, shared a photo of her in hospital in a neck brace after she said she was trampled by police horses on Tuesday.

"Police pushed me from behind," she told media on Friday through an interpreter.

"And I fell to where the horses were. The horses stepped on my back and my legs. I lost consciousness for two minutes.

"I was screaming because I couldn't feel my legs."

Camila was seen being taken from the protests in an ambulance on Tuesday. ( Supplied )

None of the protesters who spoke to media on Friday had lodged a complaint with police.

Camila refused to answer questions about the incident.



Footage showed some protesters drag a man in a white shirt to the ground as he walked outside the convention centre, while other conference delegates were spat at and heckled.

The ABC witnessed protesters verbally abuse a passer-by who was mistaken for a delegate.

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Watch Duration: 17 seconds 17 s Protesters were seen heckling, taunting and pushing businesspeople outside the conference centre on Tuesday.

Premier Daniel Andrews described the actions of protesters as "appalling" and "violent".

"[Protesters] are free to protest peacefully," Mr Andrews said.

"What they're not free to do is to act the way they acted. It's appalling conduct, absolutely appalling conduct. Violent conduct.

"I think police have done an outstanding job."

Protesters defended their tactics as "peaceful", arguing the environmental damage caused by mining practices worldwide far outweighed any concern about protest behaviour.

"We need to focus on the climate emergency that we're currently living through," protest organiser Emma Black said.

When asked if any protest behaviour this week was "unacceptable", Ms Black said "no".