U.S. Embassy in Qatar warns Americans to shelter in place as Iran and Israel exchange fire

The U.S. Embassy in Qatar warned American citizens on Monday to shelter in place.

"Out of an abundance of caution we recommend American citizens shelter in place until further notice," the embassy said in a notice posted online on Monday.

The State Department had earlier warned U.S. citizens around the world to "exercise increased caution," after the U.S. joined Israel's assault on Iran, bombing three of the Islamic Republic's key nuclear sites on Saturday.