BBCThe US is reducing the number of personnel at its Al-Udeid air base in Qatar, according to the BBC's US partner CBS News, which officials have called a "precautionary measure".
A statement by the Qatar government said the step was being taken "in response to the current regional tensions".
This comes after US President Donald Trump said the US would take "very strong action" against Iran if the authorities execute anti-government protesters. Iran says it will retaliate if attacked by the US.
According to rights groups, more than 2,400 anti-government demonstrators have been killed in the recent violent crackdown by the Iranian authorities.
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