March 24 (Reuters) - Wall Street's main indexes opened

lower on Tuesday as renewed doubts over easing Middle East

tensions tempered the previous session's relief rally despite

President Donald Trump's decision to delay strikes on Iran's

power grid.

The Dow Jones Industrial Average fell 108.6 points,

or 0.24%, at the open to 46,099.86. The S&P 500 fell 28.9

points, or 0.44%, to 6,552.09​, while the Nasdaq Composite

dropped 139.2 points, or 0.63%, to 21,807.597.