HARTFORD, Conn. (May 21) - The bank told the state that a box with back-up bank tapes were lost in February from a truck that transports and stores tapes in its storage facility, Blumenthal said. The tapes contained Social Security numbers, names and addresses and possibly bank account numbers and balances, he said.

"This security breach seems highly dangerous, indeed possibly devastating in light of the identity theft threat," Blumenthal wrote to Stephen Dolmatch, general counsel of Bank of New York Mellon Shareowner Services.