CEDAR SPRINGS, Mich. (WOOD) — Authorities are investigating after a bomb threat was made at Cedar Springs High School Thursday morning.

The Kent County Sheriff’s Office said the school was checked and cleared by a Michigan State Police K-9 unit before noon. No explosive devices were found.

The district said in a release later Thursday that the threat came in via email just before the start of school. School was canceled throughout the district, all buses were diverted and students were taken home.

Officials praised the quick response from faculty and staff and also the calm and cooperation from parents and investigators.

Officials are looking for the person who made the threat. Anyone with information about who is responsible is asked to call the Kent County Sheriff’s Department at 616.632.6100 or Silent Observer at 616.774.2345.

The school said mental health experts will offer support Friday to students who were stressed or frightened by the threat.