File Photo | Harvard High School

Harvard High School was temporarily on lockdown Thursday after police say someone used AirDrop to send multiple students a photograph indicating violence would occur at the school.

The Harvard Police Department responded around 12:20 p.m. Thursday to Harvard High School, 1103 North Jefferson Street.

Harvard Deputy Police Chief Tyson Bauman said that an unknown person or persons used Apple’s AirDrop feature to send a photograph to various students’ cellphones.

The photograph conveyed a threat of violence that would occur in the next hour at the school, Bauman said.

Police worked with Harvard Community Unit School District 50 officials and placed the school in a soft lockdown.

Bauman said the school was searched and cleared. The threat was deemed to be unfounded.

Students and staff resumed normal operations around 1:30 p.m. Thursday.

The Harvard Police Department is still investigating the origin of the threat and attempting to identify the person or persons who sent it.

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Anyone with information is asked to contact the Harvard Police Department at 815-943-4431.