US STOCKS-Wall St rallies in volatile session after ECB measures
* ECB President Draghi announces bond-buying program
* Verizon, American Express both fall after results
* Royal Bank of Canada to buy City National
* Dow, S&P 500 and Nasdaq all rise 0.7 pct (Updates to midday trading)
By Ryan Vlastelica
NEW YORK, Jan 22 (Reuters) - U.S. stocks rallied in volatile trading on Thursday after the European Central Bank announced expanded measures to stimulate the region's sagging economy, as expected.
Equities moved between positive and negative territory, with a number of disappointing corporate results from bellwether stocks spurring some morning selling.
The ECB will buy 60 billion euros worth of assets per month, an amount that was more than expected, in a program that will last through September 2016.
While U.S. stocks were volatile after ECB President Mario Draghi's news conference, shares in Europe jumped 1.5 percent. Continuación...