A federal civil rights lawsuit alleges a southern Illinois sheriff's deputy used a stun gun on three children at an emergency shelter while a fellow deputy mistreated a fourth child.

The children's guardian is suing the Jefferson County deputies, the county and Sheriff Roger Mulch.

According to the lawsuit filed July 1, the deputies responded to the shelter near Mount Vernon last summer to help control two 12-year-olds and an 11-year-old. But the three children who were allegedly shocked with the stun gun and another child who was forced into a closet after trying to intervene weren't the youths who prompted the call.

No criminal charges have been filed. And Mulch says investigations, including one by Illinois State Police, found that the deputies acted appropriately.