Why is ISIS attacking US forces in Syria? An ambush by an Islamic State gunman killed three US soldiers and one civilian interpreter in Syria on Saturday. The gunman was later found to be a member of Syria's new security forces due to be dismissed for extremist views. So, how much of a threat does Islamic State pose in post-Assad Syria? And is the country's new military ready to fight it? | Middle East Eye

National security adviser Jake Sullivan on the threat of ISIS attacking the airport in Kabul, Afghanistan: "The threat is real. It is acute. It is persistent. And it is something that we are focused on with every tool in our arsenal." | CNN