Air-raid sirens sound in Riyadh, loud explosions heard

A security alert in Riyadh carries weight beyond the immediate event, given the Saudi capital's role as a regional financial and energy hub and the rarity of such warnings there. Markets with exposure to Gulf risk — energy, regional equities and shipping — are the most directly sensitive, though the absence of confirmed cause, casualties or damage leaves the actual scope unclear. Whether this proves isolated or part of a broader escalation is the open question, and confirmation of what triggered the alerts is the next thing worth watching.