CANADA STOCKS- TSX falls at open as Middle East tensions keep investors on edge

March 24 (Reuters) - Canada's main stock index opened lower on Tuesday, as relief from U.S. President Donald Trump's decision to pause strikes on Iran's energy infrastructure faded, leaving investors grappling with uncertainty over the war.

At 09:31 a.m. ET, the Toronto Stock Exchange's S&P/TSX composite index .GSPTSE was down 0.8% at 31,614.86.