No one in Iran outright suggested that the explosion came from an attack. However, even Iranian Foreign Minister Abbas Araghchi on Wednesday acknowledged that “our security services are on high alert given past instances of attempted sabotage and assassination operations designed to provoke a legitimate response.

A massive explosion and fire rocked a port Saturday in southern Iran, purportedly linked to a shipment of a chemical ingredient used to make missile propellant, killing five people and injuring more than 700 others.