Cyber-security experts have expressed surprise that journalists at the summit between US President Donald Trump and North Korean leader Kim Jong-Un in Singapore were given USB-powered fans.
Some warned reporters not to plug them in to their laptops, as USB devices can carry malware.
But cyber-security expert Prof Alan Woodward, from Surrey University, said: "For years now, engineering people to plug in a USB stick you supplied has been a classic way of circumventing security measures to get your software on their machine.
"There's an adage in cyber-security: if you give someone physical access to your computer, it's no longer your computer. Use an unknown USB stick and you are doing just that."
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