DES MOINES, Iowa — The Iowa State Patrol and the Des Moines Police Department are investigating a stabbing at the Iowa State Fair.  At approximately 10:25 PM, Tuesday, a 21-year-old male was stabbed near the SW corner of the fairgrounds.  The victim was transported to Mercy Hospital in Des Moines in a critical, but stable condition.  The investigation is ongoing and more details will be released as they become available.