A parent called police after seeing a person holding a bag and wearing what appeared to be a bulletproof vest outside the school Thursday morning, according to WBAY.
The high school was evacuated as police swept the school for signs of a threat. A nearby middle school and a community center, where students were taking an advanced placement test, were placed under lockdown.
>> Related: #MayTheFourthBeWithYou: 'Star Wars' fans celebrate unofficial holiday
After police determined there was no threat, students returned to class.
“There was no legitimate threat at AHS today,” school officials said in a message posted to Facebook. “It was a misunderstanding where a student wore a ‘Star Wars’ costume for May the Fourth Be With You day. There was no intent of a threat, but the student will be held accountable.”
School district officials told WBAY that it has a no-costume policy and that the policy would be explained to students after Thursday’s mix-up.