Shares in Franco-Belgian bank Dexia plunged nearly 12 percent at the opening of trade on Monday following a downgrade warning by Moody\'s over concerns about its liquidity. Other French bank stocks were hit hard by a warning by Greece it would miss its agreed deficit targets, with shares in Credit Agricole and Societe Generale down nearly 7 percent, and BNP Paribas nearly 9 percent in a market down 2.9 percent overall.