"We are certainly interested in understanding as much as we can about what exactly happened [with the Russian plane], so that we can adjust our security posture as necessary to ensure the safety of the travelling public," Earnest stated.
He added that the lines of communication with Russia and Egypt regarding the A321 crash "remain open."
Russia, along with the United Kingdom and other countries, has suspended flights to Egypt following the incident after several intelligence services have suggested that terrorists may have planted a bomb onboard the Russian aircraft.
