An American destroyer operating in the northern part of the Red Sea today shot down three surface-to-surface missiles and several drones launched by Yemen's Houthi rebels, the Pentagon said.
It added that the potential targets were positions in Israel.
The Pentagon said there were no injuries among US sailors on board or among civilians on the ground.
Also, a military base in the south of Syria where American troops were training soldiers as part of the campaign against the Islamic State was attacked by drones today, two American officials said.
One drone was shot down, but the other caused minor damage, said one of the officials, who spoke on condition of anonymity.
The attacks followed similar drone strikes in the past few days on US and coalition bases in Iraq.
Syrian opposition activists told ISS that the drone attack was carried out on an oil facility in eastern Syria where US troops are stationed.
The Reuters agency, referring to two security sources, reported that drones and rockets targeted the Ain al-Asad airbase, which houses American and other international forces in western Iraq, and that several explosions were heard in the base.
The Iraqi military said it had sealed off the area around the base and launched a search operation.
Reuters reports that the sources said that it is not yet clear whether the attacks caused casualties or property damage.
The agency states that this attack is the third in less than 24 hours on air bases where US troops are stationed in Iraq.
US military forces in Iraq were targeted in two separate drone attacks on Wednesday, one of which caused minor injuries to a small number of soldiers, although the US military was able to intercept the armed drone.
Last week, Iraqi armed groups linked to Iran threatened to target US interests with rockets and drones if Washington intervened to support Israel against Hamas in Gaza.
The United States has 2.500 troops in Iraq and another 900 in neighboring Syria, on a mission to advise and assist local forces in the fight against the Islamic State, which seized parts of territory in both countries in 2014.
Ain al-Asad Air Base is located in the western province of Anbar.
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