GBP/USD fell 0.13% to 1.3502, trading near the lower end of its 1.3495‑1.3528 range.
Fed’s rate decision at 19:00 BST could surprise hawkishly amid stalled Gulf talks and higher US CPI pressures.
Euro slipped 0.13% to 1.1698, with 1.1700 seen as key psychological level amid Gulf tensions.
Australian dollar underperformed after March CPI showed 4.6% YoY inflation, markets pricing 18 bps RBA tightening ahead of meeting.