NEW: Neville Lawrence says he hopes other suspects in the case are also brought to justice NEW: The Lawrence family helped bring "much-needed fundamental reform to policing," a police body says NEW: Dobson's father shouts "Shame on you all," as his son is jailed for 15 years, a second man for 14 NEW: Lawrence's mother says she is glad the judge did not let the men "hide behind their ages" Dobson's father shouted "Shame on you all," to the packed courtroom as the sentence was read out, British media reported. The conviction was the culmination of a case that has gripped the British media for almost two decades and resulted in a government inquiry in 1999 that was heavily critical of the police for their handling of the case. Changes brought about as a result of the Macpherson Report in 1999 -- which labeled the Metropolitan Police force "institutionally racist" and said its investigation of the murder was fundamentally flawed -- continue to impact how the police and legal system operate today. Speaking outside court, Lawrence's mother, Doreen Lawrence, expressed her gratitude to those who had supported the family through their long fight for justice. It was a "difficult day," she said, but the judge had recognized the stress and suffering the family had gone through and handed down the longest sentences he could under the law. The judge also recognized the men for what they had done, she said, "and there's no hiding behind their ages." Dobson was 17 and Norris 16 at the time of the murder. Stephen Lawrence's father, Neville Lawrence, told reporters he hoped to be standing outside the court in a year's time marking the sentencing of the other men allegedly involved in his son's death. Other youths who were with Norris and Dobson on the night of the murder have long also been suspects in the case. However, extensive re-examination of material gathered at the time has not yet produced evidence for a prosecution. Metropolitan Police Commissioner Bernard Hogan-Howe told the BBC Wednesday that "the other people involved in the murder of Stephen Lawrence should not rest easily in their beds." Deborah Glass, deputy chair of the Independent Police Complaints Commission -- a body set up as a result of that government inquiry -- paid tribute to the efforts of the Lawrence family. "There can be no doubt that in their struggle they were also instrumental in bringing much-needed fundamental reform to policing in this country," she said in a statement. It is important to acknowledge the changes that have been made over the past decade, but there is equally no doubt that much remains to be done to increase the confidence of black and minority ethnic communities in policing. While the initial murder inquiry had been "truly shocking in its negligence," she added, the current investigation team deserved credit for its work on the case. Speaking outside court Tuesday, Doreen Lawrence told reporters that she felt "relief that these racist men no longer feel they can murder a black man and get away with it." But, she said, the court's decision was not a cause for celebration. Lawrence, who was 18 when he was stabbed to death in southeast London in an unprovoked attack, was a good student who had applied to study architecture at university. Stephen was a son any mother would have been proud of, Doreen Lawrence said, and she missed him with a "passion." The Macpherson Report concluded that "Stephen Lawrence's murder was simply and solely and unequivocally motivated by racism." DNA testing indicated the blood was that of Lawrence.