Boston February 23, 2019 6:21 pm 2 Killed in Mansfield Plane Crash The single-engine plane crashed nose-first into the ground Saturday, crushing the cockpit and killing an instructor and student pilot. US & World Videos 3:05 100 protesters detained at Northeastern University 2:39 Community mourns police sergeant killed on duty 2:50 Community mourns Billerica police sergeant killed on duty 4:32 Anti-war protester at Northeastern speaks amid arrests: ‘We are peaceful students' 10:42 Multiple people arrested as police clear campus encampments