A threat made earlier this week against a school in St. Joseph County Michigan has been found to be not credible.

The Three Rivers Police Department said they investigated a threat against Three Rivers Middle School that was reported around 9 a.m. on Tuesday, May 14, according to 95.3 MNC’s reporting partners at ABC 57.

The school was placed under a brief lockdown as a precaution, ABC 57 reported.

Officers determined that the unspecified threat was not credible and classes continued.