Several adults stood by watching and drinking beer as the 16 and 17-year-olds were put through the ‘hazing©– ritual by older girls at Glenbrook North High, a respected school in an affluent suburb of Chicago.

The horrific ordeal has outraged America after home videotapes of the incident were broadcast nationally.

Marina, who suffered a fractured tailbone after being kicked repeatedly by several of the older teenagers, was one of five girls who needed hospital treatment.

Another suffered a broken ankle, and a third contracted a bacterial infection after being smeared with faeces and made to swallow mud.

The younger girls were made to sit in a huddle while the older ones pelted them with urine, paint, rubbish, fish and animal intestines.