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.

By Andrew Mills, Parisa Hafezi and Alexander Cornwell DOHA/ISTANBUL/TEL AVIV (Reuters) -Iran's military said it carried out a missile attack on the Al Udeid U.S. airbase in Qatar on Monday after explosions were heard across the Qatari capital following Tehran's threat to retaliate for U.