S&P/TSX composite falls more than 300 points, U.S. stock markets also move lower

The Toronto Stock Exchange Broadcast Centre is shown in Toronto on Friday, June 28, 2013. THE CANADIAN PRESS/Aaron Vincent Elkaim

TORONTO - Canada's main stock index fell more than 550 points on Tuesday, while U.S. markets also lost ground amid uncertainty about U.S.-Iran ceasefire talks.聽

鈥淣orth American equity markets started out on solid footing today, but then 鈥 retreated as the day progressed. A key overhang was the pending deadline for Middle East ceasefire negotiations,鈥 said Kathrin Forrest, equity investment director at Capital Group.

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