Visitor arrivals surged last month, with 826,770 people coming to Hong Kong, an increase of 10.9 per cent on January last year. But the figure was still well below the 988,303 tourists recorded in January 1997 and more than 50,000 fewer than for the same month in 1996. The Hong Kong Tourist Association, which compiled the statistics, welcomed the latest sign of a revival but warned against optimism that problems plaguing the flagging industry were over. Amy Chan Cheng Yi-yum, the association's executive director, said: 'Naturally we are delighted to see such a marked improvement in arrivals for January this year. 'However, there are still challenges ahead and we cannot afford to be complacent about this upturn.' The number of people visiting Hong Kong from almost all markets increased, the association said. Arrivals from Indonesia more than doubled to 21,063, probably because of a two-week holiday there, while travellers from South Korea rose due to greater economic stability. Mainland visitors rose by 22.1 per cent to 248,525. Chek Lap Kok airport saw its highest passenger numbers during the Lunar New Year break. More than 117,000 people arrived or departed last Sunday, eclipsing the previous record of 100,000 on December 27, the Airport Authority said.