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The ECB agreed to launch a new and potentially unlimited bond-buying program to lower struggling euro zone countries' borrowing costs and draw a line under the debt crisis, Draghi said. But much of that news had been priced into the euro after a leak to the press on Wednesday, analysts said.
The euro was last at $1.2581 EUR=, down 0.1 percent on the day and close to the session low of $1.2571. The New York session has been volatile since Draghi began speaking.