President Trump has indicated that the U.S. was given prior warning of the Iranian strike. U.S. and Qatari authorities said the missiles were intercepted.

U.S. troops in the Middle East have been on high alert in the wake of the recent air and missile strikes against Iranian nuclear sites.

The countries have long worried about being sucked into regional war as they juggle relations with Washington, their security guarantor, while seeking to improve ties with Tehran.