A Carson, Calif., preschool is closing after parents learned of alleged sexual activity between 4- and 5-year-olds, according to an attorney representing the alleged victims.

Some students in the preschool class at the First Lutheran Church of Carson School would engage in oral sex during naptime, in the tunnel slide on the playground and in an outside bathroom, attorney Greg Owen told ABCNews.com.

"It all boils down to a lack of supervision," Owen said. "There were times when teachers would let aides in the room for hours at a time to watch the kids. During naptime, the aides would be sleeping and the children would have been molesting each other during this time."

Church leaders said the closing was related to the school director's resignation for personal reasons and insisted the alleged sexual incidents had nothing to do with the closure, ABC News' Los Angeles station KABC-TV reported.  Read more at ABC News