HUNDREDS of police and Correctional Services officers massed outside the gates of the High Island detention centre last night after negotiations collapsed with Vietnamese inmates holding a guard hostage. The drama erupted as Hong Kong's top refugee officials met the international community in Geneva in a bid to bring an end to the presence of boat people in the territory and elsewhere in the region. Armed with home-made spears and other weapons, the boat people were last night demanding the cancellation of an operation scheduled for tomorrow to remove more than 200 people listed for forced repatriation. Instead, the Government planned to raid the camp early today and free the officer before extracting the group targeted for deportation. The main worry for those trying to secure the camp through the night was that the Correctional Services Department officer taken captive had keys for all gates, including the perimeter gates for the entire north section of the camp which would enable a mass breakout. Almost 20,000 boat people remain in the territory.