Two men have been found guilty of the murder in London of black teenager Stephen Lawrence 18 years after his death.
Gary Dobson and David Norris were found guilty by a jury after a trial based on forensic evidence.
Scientists found a tiny bloodstain on Dobson's jacket that could only have come from Mr Lawrence and a single hair belonging to the teenager was found on Norris's jeans.
The material was discovered using advanced techniques that were not available to scientists at the time of the original case.
Stephen Lawrence was 18 when he was stabbed to death near a bus stop in south east London in April 1993.
Dobson, who is 36, and Norris, 35, denied the murder and said their clothing had been contaminated as police mixed up evidence over the years.
The BBC recalls that the case became a "signal" crime - taking on a wider political and social dimension, thanks to the dignity and humanity of Stephen's parents, who fought to fought a long campaign for justice for their son.
After the initial investigation, five suspects were arrested but not convicted.
The lawyer who represented the Lawrence family, Michael Mansfield, paid tribute to their determination to get justice.
"It is a unique achievement for a family to be able to withstand the pressures and rigours of disappointment, of frustration and the various hurdles that have been put in their way," he said.
"There has been incompetence, there has been dishonesty and so on all the way through until very recently."
An official inquiry in 1999 said the initial police investigation was woefully mishandled and concluded that the Metropolitan police were institutionally racist.
The inquiry led to reforms of the London Metropolitan Police.
