Macau's Governor, General Vasco Rocha Vieira, has warned 'serious public security problems' pose a potential threat to the enclave's autonomy. General Vieira said in his Lunar New Year message the crime problems had been caused by triad gangs jockeying for position in the underworld. The Governor, who has been at the helm of the local administration since April 1991, also said Macau was facing 'difficulties created by the international economic crisis'. He urged residents to follow the example of this Lunar New Year's zodiac sign by 'defending our values without the need to be aggressive', adding that 'as the rabbit, we must remain very steady and keen'. General Vieira described Macau's forthcoming reversion from Portuguese to Chinese administration at midnight on December 19, after 442 years of Portuguese rule, as a 'solemn moment'. Next year's address will be delivered by Macau's first Chinese chief executive.