Members of the Grove Police Department continue to investigate a series of threatening phone calls made on Thursday morning to the Bank of Grove, IBC Bank and First Bank and Trust, all in Grove.

The initial call came in before 9 a.m. to an employee at Bank of Grove.

According to Grove Police Chief Mark Morris, the unidentified male caller asked to speak to a bank official and told the employee the bank "needed to cooperate" with him.

Morris said similar calls were made to IBC Bank and First Bank and Trust. He said the calls seemed "bizarre" because the caller did not include specific demands. 

GPD notified all financial institutions in Grove, and began to maintain a security presence - including drive-bys and walk-throughs at the various banks. Banks in the surrounding area were also notified to be on alert.

Morris said in response to the calls, most banks began to initiate additional security measures on Thursday. 

Employees receiving the calls indicate the voice sounded like a young male, potential between the ages of 20 to 50, Morris added.

As of now, Morris said, the investigation continues, adding that by mid-day Thursday no other suspicious activity had taken place at the banks.

After receiving initial threat at Bank of Grove, Morris asked officers with the Grand River Dam Authority to do a flyover of the area, in order to check the parameter of the bank for potential persons of interest.