Cairo, August 2 (IANS): The US embassies in some 10 Middle East countries on Saturday warned American citizens to exercise caution and "consider departing or be prepared to depart should there be escalation." The embassies advised US citizens in the Middle East to exercise caution and heightened vigilance and to be prepared for flight cancellations, periodic airspace closures, and potential travel disruptions. They also advised US citizens outside the region to "seriously reconsider travel to and through the Middle East." Earlier on Saturday, Iran's semi-official Tasnim news agency reported that Iran has prepared an "extensive" plan to respond to potential attacks on Iranian infrastructure. The plan reportedly involves targeting vital Israeli infrastructure and US energy infrastructure in the Middle East.