Suddenly and with little warning, the Department of Homeland Security has banned electronics from carry on baggage from over 12 airlines. Thirteen countries have been affected. They are all in Africa and the Middle East. The ban starts tomorrow and runs for 96 hours.
Cell phones will be allowed, but cameras, laptops, etc. will have to be in checked luggage.
Homeland Security will not comment, but given the sudden nature and insistence it seems they must have a credible threat.