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A young man found guilty of the manslaughter of a schoolboy who was stabbed in a gang attack will not face a retrial for murder.

Junior Bayode, 19, was convicted last October. It was the last of four trials over the death of Sofyen Belamouadden, 15, of Acton, west London.

The Appeal Court ruled against the Crown Prosecution Service, which had lost an earlier Old Bailey ruling.

Sofyen was killed after being chased by youths into Victoria station in 2010.

In total 20 people were tried in connection with the death, three of whom were jailed for murder and five for manslaughter.

Sofyen, a GCSE student, was stabbed nine times in a clash between two sets of pupils from west London schools in front of hundreds of commuters on 25 March 2010, the trial heard.

The attack on the aspiring footballer lasted 12 seconds and took place during the evening rush hour.

Obi Nwokeh, 20, Christopher Omoregrie and Samson Odegbune, both 19, were sentenced to life for murder in April, with minimum terms of 18 years.

Victoria Osoteku, 20, the only woman to be charged, was jailed for 12 years for manslaughter in April, along with three other youths.

Twelve other youths received sentences for lesser offences and three were acquitted.

The series of trials in this case has lasted 21 months.

The "ferocious and merciless" attack on the schoolboy was sparked by a minor confrontation between pupils from two west London schools the day before in the fast food area of Victoria mainline station, the court heard during the trials.

Osoteku, an A-level student, was one of the people responsible for setting up the fight using text messages and Facebook. She was also seen on CCTV kicking Sofyen in the head.