US Embassy in Jerusalem: 'Due to heightened tensions in the Middle East, the security environment remains complex with the potential for unforeseen escalation. Americans currently in the Middle East should exercise caution and heightened vigilance and should be prepared for flight cancellations, periodic airspace closures, and potential travel disruptions. Some airlines in the region have postponed resumption of earlier flight schedules; others have cancelled some routes. Americans in the region should consider departing, or be prepared to depart should there be escalation.Americans outside the Middle East should seriously reconsider travel to and through the region. Those who do travel to or from the region should monitor information about airport and airline operations.'