Nine Kansas City police officers who were suspended during an internal investigation into the department's crimes against children unit will be reinstated and assigned to patrol bureau.

The Kansas City Star reports two police sergeants and seven detectives are expected to return to work Sunday. The captain who supervised the unit also has been reassigned, though he was never suspended.

The investigation began after police officials learned that cases were not being handled promptly enough. Police spokesman Capt. Tye Grant says there were never any disciplinary issues involved, so there's nothing preventing the officers from serving in a different capacity.

The crimes against children unit handled roughly 1,000 cases in 2015. It investigates abuse, neglect, endangerment, parental kidnappings and custody violations.