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Iraqi security forces found an identification on the man and said he appears to be in his 50s.

A U.S. military official said the victim's name could not be released until his family was notified.

Also, an American civilian was killed when a rocket landed in the zone on Friday night, the U.S. military said on Saturday.

The civilian was a Defense Department employee, and the rocket landed north of the U.S. Embassy. A witness told CNN the rocket struck a trailer and that the civilian was preparing to leave Iraq next week.

In January, the U.S. military handed over security of the International Zone to Iraqi security forces.