Massachusetts August 8, 2017 12:30 pm Chelsea Chemical Scare Forces Evacuation A Massachusetts Water Resources Authority building under construction in Chelsea was evacuated during a hazmat incident. US & World Videos 2:31 Fallen Billerica Police Sgt. Ian Taylor honored at vigil 2:39 MIT president calls for shutdown of student encampments 0:16 4 people seriously hurt after boat sinks off Cape Cod 2:35 Fallen Billerica police sergeant honored during vigil 2:09 President of MIT calls for shutting down pro-Palestinian encampments