An aircraft cabin ban on large electronic devices has been prompted by intelligence suggesting a terror threat to US-bound flights, says US media.
The US and UK have announced new carry-on restrictions banning laptops on certain passenger flights.
The so-called Islamic State (IS) has been working on ways to smuggle explosives on to planes by hiding them in electronics, US sources said.
The tip-off was judged by the US to be “substantiated” and “credible”.
Inbound flights on nine airlines operating out of 10 airports in eight countries are subject to the US Department of Homeland Security ban.
Phones and medical devices are not affected.
US Secretary of State Rex Tillerson is hosting a two-day meeting of ministers and senior officials from 68 nations to discuss the threat from IS.
The Washington talks will be the first full meeting of the coalition since December 2014.
The nine airlines covered by the US ban are Royal Jordanian, EgyptAir, Turkish Airlines, Saudi Arabian Airlines, Kuwait Airways, Royal Air Maroc, Qatar Airways, Emirates and Etihad Airways.
The British ban, announced hours after the American measure, is similar but applies to different airlines, including British Airways and EasyJet.
It covers direct passenger flights to the UK from Turkey, Lebanon, Jordan, Egypt, Tunisia and Saudi Arabia.