The U.S. Embassy in Qatar warned American citizens to "shelter in place until further notice," as Iran vows to hit back against the U.S. for its strikes on nuclear facilities. The embassy said in its June 23 alert that it was acting "out of an abundance of caution" but gave no other details.

The U.S. embassy in Qatar emailed U.S. citizens in the Gulf country on Monday recommending that they shelter in place until further notice, triggering a slew of messages from various Doha-based institutions to employees and students while Qatar maintained the situation was stable.

WASHINGTON — The US Embassy in Qatar on Monday advised Americans in the Gulf country to shelter in place until further notice as the region braces for Iran’s retaliation following US strikes on its nuclear sites.