A POLICE counter-terrorist study into the China Ferry Terminal in Jordan has unearthed security faults now under urgent Government consideration following the grenade attack at the Zhuhai border crossing at the weekend. Sources said a report in December last year compiled by the counter-terrorist unit attached to the operations wing of Police Headquarters showed the terminal to be a security threat. The report called for major restructuring of the terminal to better control increasing numbers of tourists, with priority given to more customs and police officers and re-construction of the interior to allow better control of queues. More than 5.74 million tourists used the terminal last year. The report, now being examined by the Security Branch, outlines a multi-million dollar package of changes. Officials have also been alerted to Bill of Rights and commercial considerations in any changes, with the Canton Road terminal now housing a large number of tenants. Opened in November 1988, the Government-run terminal was built by private operators for $333 million in exchange for commercial and residential development above the complex. ''Enhancing security against terrorist attack creates many difficulties. There's very little you can do without being too repressive,'' one police source said. ''What we need is crowd engineering for the public, but we have to juggle convenience with security. ''Anything too extreme would anger people and could be counter-productive. ''We've also got to deal with commercial operators who won't like their businesses affected.'' Sources said the deficiencies came to light in routine reviews, which found security at the territory's eight other entry points ''satisfactory''. ''Prevention is very important. There's actually very little that can be done once someone starts throwing grenades around,'' a source said. The news comes as police and customs officials wait for full reports from Macau counterparts on the weekend grenade attack, which injured five Chinese customs staff and four Macau residents. Police sources said the incident could spark further reviews once any immediate threats had been dealt with. ''Until we get the story of what actually happened from Macau, it's difficult to judge what threats are posed. We're hoping to hear very shortly.'' More than 2,500 customs and immigration officers working at checkpoints have been told to be extra vigilant. Customs officers have been advised to make increased use of hand-held and walk-through metal detectors, currently deployed at an individual officer's discretion.