US President Trump says from what I've heard, Iran is connected to the attempted attack on the plane

Attribution language of this kind, a head of state linking a state actor to an attempted attack on an aircraft, sits early on the escalation ladder and historically functions as signalling rather than evidence; the qualifiers here ('from what I've heard') are doing work, leaving room to walk back or harden. Episodes of this type have tended to play out through a familiar sequence: attribution, demands for investigation, then either quiet de-escalation via back channels or a ratcheting toward sanctions, military posturing, or strikes, with the market read hinging on which fork emerges. For Iran specifically, the transmission channel that has mattered most is the crude risk premium via supply and transit security in the Gulf, with Brent typically absorbing the headline first and gold and the franc catching the haven bid; equities have historically faded such headlines quickly unless they are followed by concrete action. What distinguishes durable repricing from a one-day wobble in past episodes is corroboration: intelligence findings, allied endorsement of the attribution, and any movement of assets or forces. The follow-ons are official statements from the agencies involved, Tehran's denial or response, and whether the rhetoric escalates toward specific threats.