Explosions were heard in the Emirati capital Abu Dhabi, Qatari capital Doha and Saudi capital Riyadh on Saturday, after U.S. and Israel launched attacks on Iran, which has vowed retaliation.
Two residents told AFP they heard the blasts. Abu Dhabi is home to a base housing U.S. personnel.
Earlier the UAE said it had closed its airspace "temporarily and partially" as an exceptional precautionary measure.
Blasts were also heard over central Doha and near the Al-Udeid military base, the largest U.S. military facility in the region, housing around 10,000 troops.
An AFP journalist saw an interceptor destroy one missile in a puff of white smoke, as Qatar's defence ministry said in a statement it had "repelled a number of attacks".
Some personnel were being evacuated from Al Udeid, a source briefed on the matter told Reuters earlier.
There was no immediate reply to request for confirmation or comment from the U.S. Embassy in Doha.
