April 20 (Reuters) - Futures for Canada's main stock index edged lower on Monday due to concerns that the U.S.-Iran ceasefire could unravel after the U.S. seized an Iranian ship and Tehran vowed retaliation.
June futures on the S&P/TSX index were down 0.3% at 5:22 a.m. ET (1022GMT).
o The U.S. has maintained a blockade of Iranian ports, while Iran has lifted and then reimposed its own blockade on marine traffic passing through the Strait of Hormuz.
o Iran also said it would not participate in a second round of negotiations that the U.S. had hoped to kick off before the ceasefire expires on April 21.
o Canada's main stock index rose for the fourth straight week on Friday, ending less than 1% below its March 2 all-time high on hopes of a resolution to the war.
o Oil prices, rose more than 6% on the news that the Strait of Hormuz is closed again. [O/R]
o Spot gold and silver prices fell 0.6% and 1.6% respectively, as the dollar firmed. [GOL/]
o Canada's close ties to the U.S. were once a strength but have become a weakness, Prime Minister Mark Carney said on Sunday, in a video message to his country.
o Carney said Canada can't control the disruption coming from its U.S. neighbor, and can't bet its future on the hope that it will suddenly stop.
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(Reporting by Tharuniyaa Lakshmi in Bengaluru; Editing by Sahal Muhammed)
