Edwin D. Rivera, 27, of Onset was arraigned in Falmouth District Court on Tuesday, April 6, on charges of threatening to commit a crime and disturbing a school assembly after allegedly making threats aimed at Kenneth C. Coombs School staff. The Mashpee Police Department said in court documents that the Coombs schoolâs assistant principal around 1:30 PM on Tuesday, March 23, reported a phone call to police in which Mr. Rivera, who is the father of a student, said he was coming to the school to âhurt the staff.â Police said the threats led the assistant principal to send an email to school staff advising them to keep students in their classrooms with doors and windows shut and that some teachers felt compelled to barricade their doors to keep students safe.