NBCUniversal July 29, 2018 12:45 pm Hazmat Scene After Person Overdoses on Fentanyl in Chelsea The hazmat situation has now been contained, and the woman who overdosed is in the hospital for treatment. US & World Videos 20:20 Karen Read murder trial: What we've gleaned from police testimony 7:01 How reclassifying cannabis will affect the Mass. marijuana business 5:10 Mental health still suffers stigma in the medical and research fields 2:34 Brawl breaks out after court hearing in Hopkinton road rage murder case 2:47 Students face disciplinary action for encampments