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U.S. forces in Syria brought down two drones that were targeting them, leading to some minor injuries, U.S. officials said on Thursday, with Washington on heightened alert for activity by Iran-backed groups as regional tensions soar during the Israel-Hamas war.

The officials, speaking on condition of anonymity, said the attack took place on Wednesday against U.S. forces at Al-Tanf base, near Syria's borders with Iraq and Jordan.

The officials did not say who was responsible for the attack.

Lebanon's Iran-aligned Al Mayadeen TV reported on Thursday that two U.S. military bases in Syria have come under attack.

Al Mayadeen reported a drone attack on the Al-Tanf base and a missile attack on the Conoco base in the countryside of the northern Deir al-Zor region. It gave no further information.

U.S. military forces in Iraq were targeted on Wednesday in two separate drone attacks, with one causing minor injuries to a small number of troops even though the U.S. military managed to intercept the armed drone.

The United States has 2,500 troops in Iraq, and 900 more in neighbouring Syria, on a mission to advise and assist local forces in combating Islamic State, which in 2014 seized swathes of territory in both countries.