|Image copyright: GETTY IMAGES|
Flights from six Middle East and North African countries has been banned from carrying on board, laptops and other electronic devices.
The UK restrictions, which also apply to tablets, DVD players and phones over certain size, come after a similar US Department of Homeland Security ban.
Flights on nine airlines from 10 airports in eight Muslim-majority countries are subject to the US move.
US officials said bombs could be hidden in a series of devices.
The BBC home affairs correspondent Daniel Sandford says the move was "obviously part of co-ordinated action with the US".
The attempted downing of an airliner in Somalia last year was linked to a laptop device, and it appears the security precautions are an attempt to stop similar incidents, our correspondent added.
Writing on Twitter, BBC security correspondent Frank Gardner said the UK announcement was expected this afternoon and would affect direct flights from several Middle East cities.
He said - like the US ban - large electronic devices including laptops, tablets and DVD players would not be permitted in aircraft cabins but would be allowed in checked baggage.
Phones are exempt from the US restrictions.
Passengers on some 50 flights a day from some of the busiest hubs in the Middle East, Turkey and North Africa would be required to follow the new US rules.
The airlines affected by the ban are: Royal Jordanian, Egypt Air, Turkish Airlines, Saudi Arabian Airlines, Kuwait Airways, Royal Air Maroc, Qatar Airways, Emirates and Etihad Airways.
They have been given 96 hours, beginning at 07:00 GMT on Tuesday, to ban devices bigger than a mobile phone or smartphone from cabins, US officials said, adding that the ban had no end date.
The Turkish government has said the US ban is wrong and should be reversed.
The Department of Homeland Security said extremists were seeking "innovative methods" to bring down jets.
In a statement, it said the US government was "concerned about terrorists' ongoing interest in targeting commercial aviation, including transportation hubs over the past two years".
Citing the Somalia incident in February 2016, as well as the 2015 downing of a Russian airline in Egypt and attacks at airports in Brussels and Istanbul, it added: "Evaluated intelligence indicates that terrorist groups continue to target commercial aviation, to include smuggling explosive devices in various consumer items."