Nine Iraqi soldiers were killed when U.S.-led coalition warplanes mistakenly struck the troops near the ISIS-controlled city of Fallujah, Iraq's defense minister said on Saturday, NBC News reported.
Khalid al-Obaidy ordered an investigation into Friday's alleged friendly-fire incident.
He said the aircraft were supporting Iraqi forces battling ISIS because poor weather had grounded the country's helicopters. The victims included one officer, according to al-Obaidy.
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Defense Secretary Ash Carter called Iraq's prime minister, Haider al-Abadi, to express condolences. Carter later told reporters that the incident appeared to be "a mistake that involved both sides."