The euro jumped on Thursday, rising to a one-month peak against the dollar on a German newspaper report that creditors would extend Greece's existing aid program until year's end, before fading after officials denied those reports.
The euro touched a session high of $1.1436 against the dollar, its best since May 18, before easing back. It last traded at $1.1374, up 0.34 percent for the day.
The euro was also up 0.10 percent against sterling, before easing.
A German newspaper Die Zeit report on Thursday about possible concessions made to Greece by its international creditors was dismissed by European Union diplomats, who told Reuters that such a proposal meant to avoid a looming Greek debt default "would definitely not fly."
The dollar index was down 0.3 percent in a second day of losses since the Fed on Wednesday trimmed economic growth forecasts and gave no clear signal on when it will hike interest rates for the first time in nearly a decade.
Jumps in gasoline prices helped lift the U.S. Consumer Price Index 0.4 percent last month after it rose 0.1 percent in April, according to the Labor Department. But the rise was shy of forecasts.