Senior Celebration June 15, 2020 2:27 pm St. John's Prep Valedictorians Deliver Graduation Speeches Mitchell Robson and Andrew Bouchie, St. John’s Prep valedictorians, give graduation speeches US & World Videos 3:05 100 protesters detained at Northeastern University 2:39 Community mourns police sergeant killed on duty 4:32 Anti-war protester at Northeastern speaks amid arrests: ‘We are peaceful students' 5:39 Billerica police sergeant hit and killed by excavator during construction detail 2:30 Arrests made in string of home break-ins targeting Asian-Americans