Washington - U.S. government is temporarily barring passengers on certain flights originating in eight other countries from bringing laptops, iPads, cameras and most other electronics in carry-on luggage starting Tuesday. The reason for the ban was not immediately clear. U.S. security officials would not comment. The ban was revealed Monday in statements from Royal Jordanian Airlines and the official news agency of Saudi Arabia. A U.S. official told The Associated Press the ban will apply to nonstop flights to the U.S. from 10 international airports serving the cities of Cairo in Egypt; Amman in Jordan; Kuwait City in Kuwait; Casablanca in Morocco; Doha in Qatar; Riyadh and Jeddah in Saudi Arabia; Istanbul in Turkey; and Abu Dhabi and Dubai in the United Arab Emirates. The ban was indefinite, said the official. A second U.S. official said the ban will affect nine airlines in total, and the Transportation Security Administration were to inform the affected airlines early Tuesday.