By 0956 GMT, the STOXX Europe 600 banking index was down 4.8 percent to 131.65 points, its lowest level since April 2009.
Among the top losers in the banking sector were Royal Bank of Scotland, Societe Generale, Credit Suisse and Deutsche Bank, all of which were down between 7.5 percent and 8.2 percent.
Copyright Reuters, 2010