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If you’re flying (back) to the U.S. from overseas, make sure that all your electronic devices have enough juice left to power-up when you reach airport security, otherwise you won’t be allowed to take them on board due to a new TSA requirement.

The Transportation Security Administration said yesterday that it was requiring certain overseas airports flying directly to U.S. airports to increase security checks on electronic items in response to concerns about new al-Qaida attempts to use them as disguise for bombs.

While the focus appears to be on smartphones, it’s also possible that passengers will be required to power-up tablets and laptops also. Devices that won’t power-up will not be allowed on board, and passengers carrying these devices may be subject to additional screening.

The TSA has not revealed which airports are subject to the new requirements, but London’s Heathrow is known to be one of them.