The S&P/TSX Composite Index edged lower on Thursday but remained above 36,500 as rising oil prices renewed inflation concerns and outweighed a largely positive set of bank earnings. Crude gained after the US and Iran exchanged recriminations over Washington's pledge to increase economic pressure on Iran by targeting its trade partners with sanctions. RBC fell more than 1% despite reporting third-quarter profit of C$6 billion, up from C$5.4 billion a year earlier, helped by wealth management, capital markets and commercial banking. CIBC declined 0.5% despite beating estimates, supported by stronger-than-expected capital markets and retail banking results. TD Bank rose more than 0.5% after net income increased 38%, driven by its US business and soaring wholesale banking profit.