WOODSTOCK –Prosecutors dropped nine of 15 charges against a Crystal Lake teen accused of setting at least five barn fires because of his age at the time of the offenses, but said they planned to start juvenile proceedings against the boy.

Andrew Wiegand, of 1472 Bridgedale Road, turned 17 on July 21. Three of the five barn fires for which he was arrested were set before then.

Assistant State’s Attorney Sharyl Eisenstein said Wednesday that Wiegand gave a videotaped confession, telling police he started the fires because he was bored and “for the rush.”