* TSX falls 38.66 points, or 0.30 percent, to 12,721.64 * Eight of the 10 main index sectors decline * Gold miners jump more than 2 percent as bullion gains * BMO rises after results; Scotiabank slips By John Tilak TORONTO, Aug 27 (Reuters) - Canada's main stock index fell on Tuesday as tensions in Syria raised the prospect the West will launch a military strike, dampening sentiment and offsetting gains in shares of energy and gold producers, which rose on higher oil and bullion prices. Also working into the mix, two major Canadian banks, Bank of Montreal and Bank of Nova Scotia, reported quarterly earnings that topped expectations. The uncertainty about Syria fueled a rush to gold, a perceived safe-haven asset, and bullion prices hit an 11-week high. Oil prices gained as the likelihood of instability in the Middle East increased supply concerns. The United States and its allies could attack Syria within days, Western envoys have told rebels fighting President Bashar al-Assad, according to sources who attended a meeting of Syrian opposition leaders and diplomats. "It makes investors wary," said Fred Ketchen, director of equity trading at ScotiaMcLeod. "You never know how far these things can go, how much it can get out of hand and what the effect is going to be." The Canadian market, which hit a three-month high the previous session, reflected weakness in world stock markets spurred by worry over Syria. The Toronto Stock Exchange's S&P/TSX composite index was down 38.66 points, or 0.30 percent, at 12,721.64. Eight of the 10 main index sectors were in the red, but both of its resource groups were trading in positive territory. The materials sector, which includes mining stocks, rose almost 1 percent, with gold miners gaining more than 2 percent. Goldcorp Inc added 2 percent to C$33.52, and Barrick Gold Corp gained 1.8 percent to C$21.91. Energy shares were up 0.4 percent. Canadian Natural Resources Ltd jumped 2.5 percent to C$32.20, and Suncor Energy Inc climbed 0.9 percent to C$36.13. Financials, the index's most heavily weighted sector, lost 0.9 percent. Toronto-Dominion Bank fell 1.3 percent to C$87.85. Shares of Bank of Montreal hit a 52-week high after the company said its third-quarter profit rose 17 percent, benefiting from higher insurance income and lower provisions for bad loans. The stock gave up some of those early gains to trade slightly higher at C$65.82. Bank of Nova Scotia posted a slightly stronger-than-expected quarterly profit and raised its dividend. The stock slipped 1 percent to C$58.08. "(The results) foster the reputation that Canadian banks have had, that they're a pretty safe place to invest your money, with regular dividend increases and higher profits," said Ketchen, who owns shares of both Scotiabank and BMO.