Massachusetts March 15, 2018 12:20 pm Students Walk Out to Call for Gun Control Action Students at schools across the country walked out of school to rally for changes to gun laws. 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