Two Newtown High School students were charged Saturday with sharing nude pictures and videos of their classmates, bringing the total of arrests in the school’s sexting investigation to five. The probe began last May when school administrators learned that several boys and girls were “sexting” — sharing nude photos and videos of themselves and their classmates — through smartphone applications like Snapchat, FaceTime, iMessage and Kik. Police said the review board is a community-based panel designed for community leaders to take a “tempered response” to what would be considered criminal actions committed by a juvenile.