A threat that prompted a Wisconsin high school to be evacuated Thursday morning was actually a student wearing a "Star Wars" costume and mask in celebration of “May the Fourth.”

Officials said they were investigating a possible threat at Ashwaubenon High School, and the school, along with Parkview Middle School and a community center were “evacuated for a short time.”

The Ashwaubenon School District said some students were taking an AP test at the time and were put into lockdown.

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Soon after, students were reported to be returning back to class, according to the Ashwaubenon Public Safety Department.

“Their [sic] was no actual threat at the high school a student came to school wearing a Star Wars costume with a mask,” the department tweeted, adding that the costume was part of “May the Fourth Be With You Day.”

The department confirmed the student was dressed as Darth Vader.

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For "Star Wars" fans, May 4 is a day of celebration, with this year being even more special as 2017 marks the 40th anniversary of the franchise.

"Thanks for your understanding as we maintaing [sic] our number one priority of keeping students safe," the district wrote.

