Lombard officials posted on X, formerly known as Twitter just after 11:20 a.m., and said police were asking people to avoid the area, while officers completed their investigation.
Chopper 7 flew over Yorktown Center just before noon, and officers could be seen carrying long guns, walking out of the mall.
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Lombard officials later said the person in question was located, and it was determined that the report was unfounded. There is no credible threat to the public.
A spokeswoman for the mall called it an "isolated incident."
A village spokesperson said the person was carrying a tripod for work being done at a business within the mall.