Massachusetts August 19, 2017 8:30 am Teen Hit by Train, in Critical Condition A teenager is in critical condition in Concord, Massachusetts after being hit by a commuter rail train while riding his bike across a railroad track walkway. US & World Videos 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 1:40 Heavy police presence near on-campus protests 4:17 Police presence grows at pro-Palestinian encampment at Northeastern