revere December 9, 2022 5:30 am Powdery Substance Found at Revere High School Police have sent the powder off to the state lab for testing to determine exactly what it is. US & World Videos 2:09 President of MIT calls for shutting down pro-Palestinian encampments 1:00 Three dead in apparent murder-suicide in Lowell 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