LANSING, Mich. (WLNS) — Waverly High School was put into lockdown mode Wednesday afternoon.

The school said on Facebook it was conducting a ‘threat assessment’ at the high school after students got a threat via “Air Drop” on iPhones.

The staff moved into lockdown mode as the Eaton County Sheriff’s Office investigated, the school said on Facebook.

“Thank you for your patience and cooperation as we take swift action to keep students and staff safe. We will update you via email with the status of the investigation,” WHS said on Facebook.

The Eaton County Sheriff’s Office said deputies weren’t able to tell who sent the message right away so school was dismissed.

Waverly Principal Tony Terranova said a sweep was done and there was no weapon found in the building.

“All evening events will be held as scheduled, and school will resume as scheduled tomorrow,” Terranova said.

Earlier in the day, 6 News was on scene and could see groups of students being escorted out of classrooms and onto buses. In addition, a K-9 unit was on scene and entered the building.