I first heard rumors of this earlier today and now find a report on Boston’s WHDH-TV 7News. If the below video viewer from Channel 7 does not work on your device, here’s the link to the story.
Also, here’s a link to the story on CBS channel 4. None of these outlets contain any specifics reporting that all involved in the incident were juveniles. The school superintendent is quoted as saying those involved have been punished by the school system but he can’t disclose any details because of student confidentiality laws.