The Macomb County Circuit Court Building in Mt. Clemens was evacuated Monday because of a bomb threat.

Sheriff Anthony Wickersham said a series of threatening calls insinuating that there was a bomb in the building were made around 9 a.m.

The building, which is at 40 N. Main Street, was searched by bomb crews.

The building reopened at 2:15 p.m.

The Sheriff’s Office is investigating the source of the calls.