WASHINGTON — Some personnel at a key U.S. military base in Qatar were advised to evacuate by Wednesday evening, according to a U.S. official and the Gulf country, as President Donald Trump has warned of possible action after a deadly crackdown on protesters in Iran.

The decision came as a senior official in Tehran brought up the country’s retaliatory attack in June at Al Udeid Air Base outside Doha, Qatar.

The U.S. official, who spoke on the condition of anonymity to discuss sensitive plans, described the move at the base as precautionary and said such measures also were being taken across the region. The official, citing the need for operational security, would not go into further detail, including whether the evacuation was optional or mandatory, whether it affected troops or civilian personnel, or how many people were advised to leave.

Anti-government demonstrations in nearby Iran began in late December, and Trump has said he is willing to conduct military operations against Iran if the Tehran government continues to kill and arrest protesters.

Trump said Tuesday that he believes the killing is “significant “ and that his administration would “act accordingly.” He has noted that he was cutting off the prospect of talks with Iranian officials and told Iranian citizens that “help is on its way,” without giving more details.

Qatar said measures at Al Udeid were being “undertaken in response to the current regional tensions.”

“The State of Qatar continues to implement all necessary measures to safeguard the security and safety of its citizens and residents as a top priority, including actions related to the protection of critical infrastructure and military facilities,” Qatar’s international media office said on the social platform X.

The base, which hosts thousands of American service members, was targeted by Iran in June in retaliation for U.S. strikes on its nuclear facilities.

The U.S. military maintains a variety of troops in the region, including at Al Udeid, but the Trump administration shifted some resources to the Caribbean Sea.