NEW YORK (Reuters) - U.S. and European shares tumbled on Tuesday on concerns that higher interest rates and pro-growth U.S. policies were on hold, boosting safe-haven Treasuries and gold prices, while the euro hit a more than six-week high against the dollar on soothed French election worries.

The U.S. S&P 500 financial sector .SPSY fell as much as 2.8 percent and was on track for its biggest daily plunge in nine months. Analysts attributed the selling to reduced confidence that U.S. President Donald Trump's pro-growth policies, including financial deregulation, would occur soon, and to concerns of a dovish Federal Reserve.

The Fed stuck to its outlook for two more hikes this year last week, instead of the three expected by many market participants.

The tech-heavy U.S. Nasdaq Composite fell as much as 1.7 percent after hitting a record intraday high earlier on the back of Apple AAPL.O shares, which briefly touched a record $142.80 a share before falling.

Europe's broad FTSEurofirst 300 .FTEU3 stock index also fell after earlier hitting a 15-month high. It closed down 0.50 percent, at 1,480.99.

“Led by financials and industrials, the stock selloff suggests that investors may be less confident that the Trump administration’s pro-growth announcements will be translated into policy implementation soon,” said Mohamed El-Erian, chief economic adviser at Allianz in Newport Beach, California.

MSCI's all-country world equity index .MIWD00000PUS was last down 2.72 points, or 0.6 percent, at 448.34.

The Dow Jones Industrial Average .DJI was last down 193.85 points, or 0.93 percent, at 20,712.01. The S&P 500 .SPX was down 24.57 points, or 1.04 percent, at 2,348.9. The Nasdaq Composite .IXIC was down 88.32 points, or 1.5 percent, at 5,813.21.

The euro EUR= hit $1.0819, its highest level against the dollar since Feb. 2. Centrist Emmanuel Macron cemented his position as front-runner in the first televised French presidential debate on Monday versus anti-European Union contender Marine Le Pen.

The euro gained on relief over the debate results, since a win by the far-right Le Pen is seen as posing a risk of euro zone break-up.

“Any news between now and the French election next month that suggests fading risk of a Le Pen victory would probably be supportive of the euro,” said Omer Esiner, chief market analyst at Commonwealth Foreign Exchange in Washington.

U.S. crude oil prices hit a one-week low of $47.27 a barrel as the market discounted the latest talk by OPEC that it would extend output cuts beyond June.

Brent crude LCOc1 was last down 71 cents, or 1.38 percent, at $50.91 a barrel. U.S. crude CLc1 was down 84 cents, or 1.74 percent, at $47.38 per barrel.

Safe-haven spot gold and U.S. Treasuries benefited, with gold hitting a more than two-week high of $1,247.60 an ounce and benchmark 10-year U.S. Treasury yields US10YT=RR touching a nearly three-week low of 2.421 percent.