April 1 (Reuters) - U.S. stock indexes opened lower on

Tuesday, marking a gloomy start to the quarter, as investors

braced for the impending storm of sweeping tariff announcements

from the Trump administration.

At 09:30 a.m. the Dow Jones Industrial Average

fell 154.65 points, or 0.37%, to 41,845.98. The S&P 500

lost 20.54 points, or 0.37%, to 5,591.31 and the Nasdaq

Composite lost 77.45 points, or 0.45%, to 17,221.83.