SOUTHFIELD (WWJ) – There was some concern in Southfield Sunday morning after an ISIS flag was seen hanging from the side of a truck near the United States Army Reserve Center.

Officials told WWJ Newsradio 950 that the flag was being used as a part of an anti-terrorism training exercise, and the truck had briefly left the property.

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Such a vehicle wouldn’t normally leave the base, and officials understand why there would be confusion and apologized.

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They say using foreign flags and symbols make their exercises authentic.

It happened as tensions were high following a group claiming to be the Islamic State Hacking Division reportedly posting information on the Internet, including photos, of about 100 members of the Air Force, Army and Navy, according to SITE Intelligence.

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The US Marine Corps urged members of the military, in a statement, to be especially cautious online and limit the amount of personal information available about them.