Medical advisories issued for vulnerable groups.

Syria's aging air force is largely Soviet-supplied, posing a possible scenario where similar models of jets and choppers could be flown by local and Russian pilots.

Israel, according to diplomatic officials, made clear it was opposed to the move in the “strongest terms,” and said it viewed the step as “very grave.”

A number of alleged Jewish extremists have been arrested since the attack, including three placed under administrative detention, but neither the Shin Bet nor the Israel Police have said if any are suspected of being involved in the attack.

The administration itself is concerned that militants from Islamic State or al-Qaida might slip into the country as refugees.

Stop the Bomb, an organization that was founded in Austria in 2007 and that opposes the Iranian government, sharply criticized Fisher.

MDA called to scene after reports of strong smell of gas in building.

It is misplaced to view ISIS as posing an independent serious strategic challenge.