CLEVELAND -- A dozen Cleveland firefighters have pleaded guilty to charges related to a payroll investigation.

Each of the 12 were indicted on theft in office and receiving improper compensation charges.

As a result of their guilty pleas, the firefighters were sentenced to six months in jail and a $1,000 fine. Judge Carolyn Friedland then suspended both the jail time and fines.

They were: Peter Corso, 48, of Concord; Kevin Dever, 43, of Cleveland; Bernard Fronhapple, 52, of Rocky River; Robert Graham, 52, of Lakewood; Barry Kifus, 41, of Painesville; Kevin P. Kelly, 52, of Olmsted Falls; Thomas Jurcisin, 52, of Cleveland; Daniel Losteiner, 45, of Cleveland; Gary McNamara, 49, of Bay Village; Michael Milano, 54, of Broadview Heights; James Oleksiak, 44, of Cleveland; and Nicholas Rucella, 49, of Cleveland.

All 12 will have to pay court costs.

They will also be suspended without pay for eight months.

City of Cleveland Safety Director Michael McGrath said the firefighters will now undergo review for possible administrative charges.

The charges grew out of a 2011 audit of the department's payroll procedures.

As a result of the investigation, it was discovered that the firefighters paid their own co-workers for working shifts that were assigned to them.

The audit revealed, from 2006 through 2010, that at a minimum, the firefighters each failed to work 2,000 hours (approximately one year) of their scheduled time.

A case against the thirteenth firefighter is still pending.