ASHWAUBENON, Wis. (AP) -- A student dressed as a storm trooper for "Star Wars Day" prompted the evacuation of a Wisconsin high school when a frightened parent saw the costumed figure entering the facility and called 911.

Police in Ashwaubenon near Green Bay say the parent saw the student going through a back door Thursday wearing body armor and a mask, and carrying a bag.

Police Capt. Jody Crocker says the parent did the right thing given the suspicious situation, and that any perceived threat -- real or otherwise -- can't be taken lightly.

School officials say they will re-emphasize the district's no-costume policy.

Fans have adopted May 4 as "Star Wars Day" because "May the fourth" is a play on the oft-repeated Star Wars phrase, "May the force be with you."

Copyright 2017: Associated Press