Plans by international terrorists aiming at Hong Kong have twice failed in the past 25 years, but a leading expert on global terror said yesterday the SAR could not be ruled out as a target. Professor Paul Wilkinson, an academic and author on political violence, says Islamic fanatics may now focus their hate on so-called 'lesser Satans'. Security sources also told the South China Morning Post that the US attacks had prompted a top-level security review for the World Economic Forum, to be held here at the end of next month, and for the Pacific Economic Co-operation Conference, scheduled for November at the Convention and Exhibition Centre. Professor Wilkinson, of the Department of International Relations at St Andrews University in Scotland, said: 'The organisation [Osama bin Laden's network] I suspect is behind this hate what they call the 'lesser Satans' almost as much as the Great Satan [US]. 'Do I think that America is the only target? No. Certainly Israel and Britain come high up, but other places which have close links to the US and are seen as centres of significant US-Western business interests should be on high security vigilance. 'I don't think any of us can comfortably think we are immune. We must also not overlook the danger that the magnitude of this attack could inspire other groups to emulate it in some way.' Hong Kong police were placed on alert last year after warnings that Xinjiang separatists could be planning an SAR terrorist attack. Professor Wilkinson warned that the mainland Muslim extremists had received training at Taleban camps in Afghanistan. He also recalled a failed plot by the British-educated and bin Laden-funded bomb-maker Ramzi Yousef, who was jailed recently for the 1993 bomb attack on the World Trade Centre. In 1995, Yousef plotted to blow up 12 American planes over East Asia, including one over the Kowloon City approach to Kai Tak Airport. Hong Kong was also the subject of an alert in 1978. Hundreds of police were placed on high alert after 'credible' intelligence was received that one of the world's most feared terrorists, Illich Ramirez Sanchez - known as Carlos the Jackal - was working with the Japanese Red Army, an infamous terrorist group. Intelligence reports revealed their plan was to shoot down a Lufthansa flight on its approach to Kai Tak Airport using a rocket-launcher from a Kowloon City vantage point. The alert remained in place for three months before being eased. Sanchez was finally caught by French agents in Sudan in 1994 and has since been jailed.