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Some overseas airports with direct flights to the US have been ordered to intensify screening of electronic devices.
The Department for Transport said: “Make sure your electronic devices are charged before you travel. If your device doesn’t switch on, you won’t be allowed to bring it onto the aircraft.”
An official told the BBC that Heathrow was among the airports affected.
The US announced new security measures last week in response to a terror threat, but gave no details.
Airlines and airports are obliged to meet security standards set by the US Transportation Security Administration (TSA) in order to carry on operating non-stop flights.
The TSA’s statement gave details of enhanced screening of electronic equipment for the first time.
“During the security examination, officers may also ask that owners power up some devices, including cell phones,” it said.
“Powerless devices will not be permitted on board the aircraft. The traveller may also undergo additional screening.”
Officials had singled out mobile phones made by Apple and Samsung for extra checks, Reuters reported.
The UK, France and Germany have all said they would comply with the US demands, but it is still not clear how many airports will be affected, or if passengers will be delayed.