The UK has announced a ban on bringing laptops on to certain flights from Middle Eastern countries, following a similar move by the US.
Downing Street said the restriction would apply to inbound direct flights from Turkey, Lebanon, Jordan, Egypt, Tunisia and Saudi Arabia.
Passengers will not be able to bring laptops, tablets, and other portable devices into the cabin.
Standard size mobile phones will still be allowed but devices are longer than 16cm, wider than 9.3cm wide and 1.5cm in depth will need to be checked in.
Devices larger than a mobile phone have already been banned from cabins for US-bound flights from eight Muslim-majority countries following an unspecified terror threat.
In February last year an explosive device concealed in a laptop was used to bomb an airliner after it took off from Mogadishu airport in Somalia, east Africa.
Announcing the new UK restrictions, a Government spokesman said: "Decisions to make changes to our aviation security regime are never taken lightly.
"We will not hesitate to act in order to maintain the safety of the travelling public and we will work closely with our international partners to minimise any disruption these new measures may cause."
The news comes weeks after it was revealed that UK security services have foiled 13 potential attacks in less than four years, while counter-terrorism units are running more than 500 investigations at any time.
The official threat level for international terrorism has stood at severe, meaning an attack is "highly likely", for more than two years.
The US restrictions will be in place initially for nearly seven months before it is reviewed, officials said on Tuesday.
Earlier, the Department for Homeland Security said the procedures would "remain in place until the threat changes" and did not rule out expanding to other airports if circumstances changed.
In a statement on Tuesday, the US Government said: “The US government is concerned about terrorists’ ongoing interest in targeting commercial aviation, including transportation hubs over the past two years, as evidenced by the 2015 airliner downing in Egypt; the 2016 attempted airliner downing in Somalia; and the 2016 armed attacks against airports in Brussels and Istanbul.
“Evaluated intelligence indicates that terrorist groups continue to target commercial aviation, to include smuggling explosive devices in various consumer items.”
The restrictions apply to airlines flying direct to the United States from airports in Muslim-majority countries Jordan, Egypt, Turkey, Saudi Arabia, United Arab Emirates, Kuwait, Morocco and Qatar.
The airports affected by the US ban are in Amman, Cairo, Kuwait City, Doha, Dubai, Istanbul, Abu Dhabi, Casablanca, Morocco; Riyadh and Jeddah, Saudi Arabia.
Etihad Airways, Qatar Airways, EgyptAir and Turkish Airlines also said on Tuesday they were subject to the US ban. Saudi Arabian Airlines (Saudia) and Royal Jordanian said on Monday they were applying the restrictions.
Other Middle East carriers Royal Air Maroc and Kuwait Airways are also expected to be impacted.
The restrictions will not affect any US airline as they do not fly to the ten airports.
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