GRAND ISLAND, Neb. (AP) — The Hall County Board of Supervisors has voted to hire a Lincoln law firm to lead an investigation into the Hall County Jail.

The board voted Tuesday after a short meeting with the county’s attorney, Jack Zitterkopf. The newspaper says Zitterkopf declined to specify what led to the investigation of the jail.

Corrections Director Fred Ruiz said that there had been complaints recently filed by jail staff and that one employee who made allegations quit her job last week. He declined to give further information about the complaints.