Futures tracking Canadian stocks edged lower on Friday amid heightened uncertainty in the Middle East. The US threatened an indefinite naval blockade of Iran, reviving concerns about disruptions to crude supplies from the region. Oil prices moved higher, fueling inflationary pressures and weighing on financials and other credit-sensitive shares. Meanwhile, gold prices rebounded after earlier losses, lending support to mining stocks. On the earnings front, Bird Construction beat second-quarter profit estimates, prompting at least three brokerages to raise their price targets on the stock. Air Canada’s revenue for September and October is likely to reach records for the two months as more premium travelers avoid the heat and summer crowds in Europe and Japan, according to a senior executive. Canadian Tire beat estimates for both EPS and revenue in the second quarter. Onex said its second quarter showed progress toward several strategic goals.