Eighteen Syrian fighters allied with the United States in the fight against the Islamic State were killed by a U.S. airstrike, the military said on Thursday.
The strike, on Tuesday in Tabqah, Syria, was the third time in a month that U.S. airstrikes have killed civilians or allies, the New York Times reported.
The incident comes even as the Pentagon is investigating two previous airstrikes ordered by president Trump that killed or wounded scores of civilians in a mosque complex in Syria and in a building in the west of Mosul, Iraq.
The United States Central Command, which oversees combat operations in the Middle East, said in a statement that the target location turned out to be a “fighting position” for the Syrian Democratic Forces, who have been fighting the Islamic State alongside the United States.
“The coalition’s deepest condolences go out to the members of the S.D.F. and their families,” Central Command said in the statement, calling the episode “tragic.” Military officials said the cause is being investigated.
At this rate, Trump will end up killing more U.S. allies than ISIS.