The Globe and Mail reports in its Friday edition that Canada's main stock index edged lower Thursday while U.S. markets also lost ground as geopolitical concerns sent oil prices higher. A Canadian Press dispatch to The Globe says uncertainty continues over the U.S. war with Iran and when oil tankers will once again be able to freely exit the Persian Gulf. The October crude oil contract was up $2.44 (U.S.) at $86.83 (U.S.) per barrel. The S&P/TSX Composite Index was down 36.37 points at 36,365.42. The losses were broad, led by the financial sector. In the U.S. market, relief that swept the bond market just a day earlier disappeared on Thursday. The bond market remains the centre of the action after yields charged higher through the summer. U.S. Treasury Secretary Scott Bessent made a surprise move Wednesday that brought some temporary relief. His department said it will at least double the size of its planned purchases of longer-term Treasuries from Sept. 9 through Nov. 4. The market was underwhelmed by the move, with the 10-year Treasury yield rising to 4.70 per cent from 4.65 per cent late Wednesday. The Dow was down 703.84 points at 52,759.21 and the Nasdaq composite was down 263.92 points at 26,067.17.