VIETNAMESE boat people have threatened to stand with their children on hut roofs and injure Correctional Services Department (CSD) officers if a repatriation operation goes ahead this morning, sources close to the refugees claimed last night. Police and CSD officers last night were preparing to assemble forces on a vantage point overlooking High Island Detention Centre. If the boat people fail to emerge by 8 am, the forces plan to enter the camp and remove detainees for a repatriation flight to Hanoi on Friday. About 70 boat people are designated to board the Royal Brunei aircraft as part of the Government's Orderly Repatriation Programme. Similar operations before have drawn death threats against CSD staff but last night the source said camp workers were treating them seriously. The operation will be the second of its kind at the camp, coming exactly two months after 21 people were removed. High Island, divided into North and South camps, is a temporary home to 3,248 Vietnamese. The first forced removal of Vietnamese for repatriation, from Whitehead Detention Centre in April, resulted in hundreds of injuries and controversy over the use of tear gas. The operation resulted in on-going court action against CSD officers. Non-governmental organisations Christian Action and Oxfam, with several Justices of the Peace, were due to monitor this morning's operation. Boat people removed from High Island today will be transferred to Victoria Prison for pre-flight documentation and medical checks. A government spokesman said 50 High Island residents had been asked on November 18 to present themselves for transfer, and CSD staff would remove 11 people who had failed to do so. The operation comes as top government officials today head for Vietnam, where they will ask Hanoi to take urgent steps that would help avoid any further release of asylum-seekers from Hong Kong's detention centres. Secretary for Trade and Industry Brian Chau Tak-hay, who is heading an official trade delegation to Vietnam, last night pledged to raise the boat people problem. He said the issue had been hastily added to his delegation's agenda after last week's release of 125 asylum-seekers, who Vietnam had refused to allow to be repatriated, and a public outcry over the Government's decision. 'The people of Hong Kong would expect me to raise this,' he said. 'It was not originally on our agenda but it would now be extremely odd if I didn't mention this.' Mr Chau will reiterate the Government's concern over Hanoi's rejection of the 125, and urge Vietnam to co-operate in finding a solution. Chief Secretary Anson Chan Fang On-sang yesterday denied a reported secret plan to release another 5,000 boat people, but admitted the Government could not hold on to them for ever. 'On the one hand, we are going to continue our discussion with the Vietnamese officials with a view to persuading them to take back these Vietnamese migrants as soon as possible,' she said. 'But of course, to the extent that we have not yet sorted out some of the arrangements with the authorities, we cannot go on indefinitely holding these Vietnamese refugees.' The administration has repeatedly refused to rule out further releases. Executive Councillor Professor Felice Lieh-mak said the administration was in a dilemma since its legal advice was that it would be illegal to detain boat people refused entry to Vietnam. 'There will be a difficult situation if the Vietnamese Government refuses to take back those people,' she said.