Associated Press is now reporting that flights from Amman AMM, Caïro CAI, Casablanca CMN, Jeddah JED, Kuwait KWI, Doha DOH, Riyad RUH, Istanbul IST, Abu Dhabi AUH & Dubai DXB to and from the United States are affected.
The Department of Homeland Security (DHS) seems to have acted on intelligence over a threat from AQAP (Al Qaeda in the Arabic Peninsula), which have the knowledge to build small explosive devices that can be hidden in laptops, etc.