A CORRECTIONAL Services officer was being held hostage last night by detainees at the High Island Vietnamese detention centre after a violent confrontation in which tear-gas was fired. Negotiations with the captors, armed with home-made weapons, broke down shortly before 9 pm and security officials were forced to mount an operation to free the officer. Late last night, a Correctional Services spokesman said a raid on the camp would be carried out before dawn. He said the aim was to free the officer and remove 210 Vietnamese listed for removal and repatriation to Vietnam. The removal operation had been scheduled for tomorrow but the hostage drama brought it forward a day. The officer was snatched when a gang of about 20 Vietnamese tried to smash its way out of the north camp into the south camp. The officer had keys to all gates in the north section of the camp including perimeter gates when he was snatched. Another officer had his arm broken in the confrontation and 11 tear-gas canisters were fired. The injured officer, Suen Yuk-lun, 27, was taken to Prince of Wales Hospital. 'They ignored the warning and we fired tear-gas. After they retreated back to the north section we found one staff member was missing,' a department spokesman said. A third officer had a gold necklace grabbed from his neck. At this point the CSD Emergency Unit was called in and a full security plan was implemented. Assistant CSD Commissioner Bonnie Wong Yuk-man immediately went to co-ordinate the operation. At 5.30 pm, the CSD officer was dragged on to a rooftop in the north camp and held there for 30 minutes by three men with home-made swords. As darkness fell, communications were maintained with the officer who carried a two-way radio. A CSD negotiator was later sent in to discuss the crisis with the captors. The major concern was that a mass breakout could be launched if the detainees used the captured officer's keys. About 4,000 people are held in the north and south camps. A department spokesman said the captors were demanding that no police be sent in and that no people be removed from the camp for return to Vietnam. About 100 detainees were thought to be armed. Almost all of them were to be removed from the camp tomorrow. By 10 pm about 25 police trucks, three fire engines and an ambulance were outside the camp. A government helicopter was standing by and a Marine Police launch and two speedboats patrolled the western perimeter. Despite the tension in the hut housing the CSD officer, the camp appeared calm throughout the evening with children playing as usual in the central recreation ground. By 8.50 pm negotiations collapsed. 'The negotiator has drawn a blank and has come to the view that there is no point negotiating with these guys because they don't want to listen,' the CSD spokesman said.