Police expect to charge the teenager with reckless conduct and assault

Footage was uploaded online where people have condemned her actions

Boy was filmed being hit twice in the face by the girl in a park on Friday

A 14-year-old girl who was filmed punching a disabled boy in a park near Melbourne has been arrested after the footage was posted online.

The boy, who is believed to have a mental disability, was punched twice in the face by the girl at Pakenham, south east of Melbourne, last Friday.

The 18-year-old was sitting on a trolley in Bourke Park when the girl was filmed approaching him, hitting him and walking away as she inspected her knuckles.

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The boy, who is believed to have a mental disability, was punched twice in the face by the girl at Pakenham, south east of Melbourne, last Friday

The special needs student was filmed throwing his head back and slumping forward after he was hit.

Several onlookers can be heard in the background of the video laughing as the boy was punched.

Footage of the incident was uploaded online and the girl was immediately condemned for her actions.

Pakenham Police Acting Sergeant Marcus Coolen told Daily Mail Australia the 14-year-old girl was dealt with after being arrested over the incident on Tuesday.

She is expected to be charged on summons with reckless conduct causing injury and assault.

Srg Coolen said police only became aware of the incident when the footage went viral online.

He was sitting on a trolley in the park when the girl approached him and punched him twice in the face. The boy was filmed throwing his head back and slumping forward after he was hit

The boy was filmed throwing his head back and slumping forward after he was hit

'The victim has now made a statement and doesn't recollect the incident because he was very intoxicated,' he said.

'Apparently the male was being verbally aggressive. (The girl) was unaware it was being filmed.'

The girl took to Facebook after the incident to justify her actions.

'First of all he was threatening me and my closest friends saying he was going to hit us and he actually raised his fist to me,' she wrote.

'Second of all everyone that was there wanted to do it but didn't have the balls to.'

The 14-year-old girl was filmed walking away and inspecting her knuckles after she hit the boy

The girl, who took to Facebook after the incident justifying her actions, has been arrested by Victoria Police

She later offered an explanation for her actions after people started taking her to task on social media.

'Yes it was wrong and I know that, but he brought it on himself by thretening (sic) me. Of course I was going to stick up for myself wasn't going to stand there and be spoken to like that or threatened like that,' she wrote.

'He might be disabled by he still knows what's right and wrong.

'I feel as low as f*** and I apologise by I can't f***ing take it back or I would.'