Two men, who were jailed indefinitely for their part in a sustained and brutal attack on a teenager, have failed in an Appeal Court bid to clear their names.

James Jones, 24, of Bulstrode Avenue, Hounslow, and Jeyathash Chandran, 23, of Chaucer Avenue, Hayes, were sentenced on Friday to indefinite imprisonment for public protection after being convicted at Isleworth Crown Court in October 2006. Their attack, carried out with a large gang, left victim Partheepan Paratharajan both mentally and physically scarred after he was tortured and humiliated.

Three judges upheld the men's convictions for violent disorder and wounding with intent and Jones for kidnapping at the Criminal Appeal Court in London. Jones also failed in a separate challenge to his open-ended prison terms.

Giving the court's judgment, Judge Henry Globe, described how Mr Paratharajan was dragged off the street in Hayes and bundled into a car on August 7, 2005.

He was beaten as he was driven to a park in Southall, where a gang forcibly shaved his head, face and eyebrows and threatened him with knives and other weapons. He was driven back to Hayes where he was assaulted in an alleyway by youths.

Having ruled that neither Jones nor Chandran had arguable cases against their convictions, Judge Globe, who sat with Lord Justice Moses and Mr Justice Cranston, said it was "inevitable" that Jones and Ketheswaran were jailed indefinitely.

They will serve at least five years.