A MASSIVE weapons and alcohol haul was made by police at Whitehead Vietnamese detention centre yesterday following the murder of a detainee awaiting repatriation. A total of 79 homemade weapons were found during a five-hour search by about 150 Police Tactical Unit officers in Camp B of the voluntary repatriation centre. Police now believe the murder of Lau Va Sau, 23, followed a brawl involving at least 20 people and plans are in place for an identity parade to be conducted over the weekend. During the brawl, which began in the recreation room, another man, aged 22, was injured and was last night under guard in the Prince of Wales hospital. The violence in Camp B at Whitehead comes on top of what reliable sources said was a stabbing at Whitehead on Wednesday involving a ''well-known troublemaker'' who had been transferred there from Nei Kwu Chau. ''This guy had only been in Whitehead for a short time before he was stabbed in the shoulder. He had originally come from Whitehead and it was an act of revenge,'' one source said. The stabbing followed an article in the South China Morning Post this week which reported warnings that the transfer of well-known troublemakers to Whitehead could cause unrest. A Correctional Services Department (CSD) spokesman said he had not been notified of any stabbing incident involving any of the people transferred from Nei Kwu Chau which was closed on Thursday. The group involved in the brawl in the repatriation centre at Whitehead were from south Vietnam. Many of them left yesterday as part of the group of 341 people on this year's first voluntary repatriation flight. Lau, who died of a stab wound to the chest, was also due to return to Vietnam after spending what aid workers said had been several years in detention. The violence in Camp B is seen as a setback to the voluntary repatriation programme. The Government and the United Nations High Commissioner for Refugees (UNHCR) have been struggling to encourage people to join the programme and this latest violence in the departure centre has raised concerns. ''We are trying to get people to join the voluntary repatriation programme but that job is made difficult when there are weapons obviously so readily available in the camps - even in the departure centre where they're waiting to get on the plane home,'' a UNHCR worker said. The weapons seized yesterday included knives and clubs made with aluminium window framing, metal piping, window panes and nails. A CSD spokesman said searches were conducted on a weekly basis but in different sections each time. He said the haul was not surprising. Large quantities of rice wine were also seized. The violence took place in a dormitory area set aside for single men and was believed to have been sparked by an argument over a group of detainees making too much noise. No arrests have been made. It is understood that extra patrols and searches will be made by CSD officers over the next few days in all sections of Whitehead. About 19,000 people are housed at Whitehead. Refugee Concern spokesman Pam Baker said the violence would only get worse unless the CSD acted to ''clean up'' all the detention centres in Hong Kong.