An American military aerial refueling tanker that was involved in the U.S. military operation in Iran crashed in western Iraq on Thursday, multiple U.S. officials told CBS News.

The six U.S. crew members who died when their military refueling plane crashed in Iraq while taking part in Iran war operations this week were publicly identified Saturday.

The U.S. Central Command, which oversees the Middle East, said the crash followed an unspecified incident involving two aircraft in “friendly airspace,” and that the other plane landed safely.