The US has announced a ban on electronic devices from cabin baggage on flights from eight mainly Middle Eastern and North African countries.
Officials said extremists were planning to bring down passenger jets with bombs hidden in laptops, tablets cameras, DVD players and electronic games.
The measure will affect nine airlines operating out of 10 airports.
Large electronic devices will only be allowed on board in checked baggage. Phones are exempt from the new rules.
US officials said the airlines had been given 96 hours, beginning at 07:00 GMT on Tuesday, to ban devices bigger than a mobile phone or smartphone from cabins. They said the ban had no end date.The airports affected are:
Queen Alia International, Amman, Jordan
Cairo International Airport, Egypt
Ataturk Airport, Istanbul, Turkey
King Abdulaziz International, Jeddah, Saudi Arabia
King Khalid International, Riyadh, Saudi Arabia
Kuwait International Airport
Mohammed V International, Casablanca, Morocco
Hamad International, Doha, Qatar
Dubai International, United Arab Emirates
Abu Dhabi International, United Arab Emirates
The nine airlines are:
Saudi Arabian Airlines
Royal Air Maroc
Etihad AirwaysHomeland Security Secretary John Kelly called members of Congress over the weekend to explain the security issues behind the ban, congressional aides said.
The restrictions had been under consideration for several weeks, US media said.