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A disabled girl attacked by three vicious teenage thugs was forced to inhale glass before having her head smashed off a table and her hand burnt on a barbecue.

The unidentified 17-year-old victim - whose face was left disfigured by the attack which has shocked Australia - was lured to a park by the girl gang who booted her in the face before abandoning her.

The disgusting attack, which happened in the state of Victoria, was filmed on one of the offender's mobile phones before being shared with classmates on Facebook.

In a statement the girl's devastated mother said her daughter was tricked into going to the park, believing she was meeting up with her boyfriend.

(Image: Ten News) (Image: 7 News) (Image: Ten News)

The mother, who cannot be named, said her daughter "will never be the same again" after the attack that left her "black and blue"

"She's unrecognisable. She can't put her glasses on because her cheekbones are so swollen," she said.

During the attack, the intellectually disabled victim was forced to inhale glass, believed to be from her smashed iPhone.

Her hands were burnt on a hot barbecue, her head was repeatedly slammed into a wooden picnic table and she was kicked in the face.

The victim was taken to hospital after the attack, where she was treated for serious injuries to her face.

She is now recovering from the vicious attack at home.

(Image: Ten News)

(Image: Ten News)

The alleged offenders were three teenage girls, two 15-year-olds and one 12-year-old.

The girls have since been charged with assault and robbery.

The 12-year-old was released on bail, but the two 15-year-old girls were not, Ten News reported .

Detective Senior Constable Michael Thek said the assault was extremely serious.

"The footage is pretty graphic and a lot of senior police officers here say it's one of the worst assaults they've seen in 30 years or so".