According to the agency, the alert was issued "due to the possible launch of airstrikes with air-to-ground and/or cruise missiles within the next 72 hours, and the possibility of intermittent disruption of radio navigation equipment, due consideration needs to be taken when planning flight operations in the Eastern Mediterranean/Nicosia FIR area".
According to the European-based media reports, the initial alert notification was issued by the Network Manager Operations Centre (NMOC).
"The United States through the White House, through the State Department and others as well have been having conversations with our allies and partners overseas," Nauert said. "We are looking for a coordinated response, whatever that response might be, to the situation in Syria."
Meanwhile, the nuclear-powered aircraft carrier Harry S. Truman has left from Norfolk, Virginia for a deployment in the Middle East and Europe, US media reported earlier. The guided-missile cruiser Normandy and guided-missile destroyers Arleigh Burke, Bulkeley, Forrest Sherman and Farragut also accompany the Harry S. Truman, Stars and Stripes reported earlier citing US Navy officials.
Russian Envoy to the United Nations Vassily Nebenzia has told earlier on Tuesday at the UNSC's meeting that the US would bear the responsibility if it launches the military operation against Syrian government ignoring the lack of UN Security Council approval.
"If you took the decision to carry out an illegal military adventure — and I do hope that you will come to your senses — well, then you will have to bear responsibility for it yourselves," Nebenzia said.