U.S. Treasury Secretary convenes calls with top U.S. bankers

WASHINGTON (Reuters) - The U.S. Treasury Secretary said on Sunday he had held a series of phone conversations with top American bankers in what appeared to be a bid to ease nerves in financial markets.U.S. stocks have plunged in recent weeks on concerns over slowing economic growth, with the S&P 500 index on pace for its biggest percentage decline in December since the Great Depression. "Today I convened individual calls with the CEOs of the nation's six largest banks," Treasury Secretary..