Wall Street's sluggish overnight performance deterred investors in Hong Kong, leaving the market at the mercy of sellers of China Mobile and China Unicom. The cellphone twins crashed a further 5% on fears of increased competition in their mainland market, dragging the Hang Seng index down 257.66 points to 11,183.06. HSBC shares, a favourite of ING Barings but a sell according to Salomon, dropped HK$1.50 to HK$90 on revived fears of the Argentinian fallout, although less than 1% of the bank's assets are tied up in the country.