Massachusetts December 31, 2018 9:15 am Warren Announces Forming Exploratory Committee Massachusetts Sen. Elizabeth Warren is taking the first major step towards a potential run for the 2020 presidency. US & World Videos 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 1:40 Heavy police presence near on-campus protests