coronavirus March 30, 2021 7:45 am CDC Warns of Fourth Wave As COVID Cases Rise in Mass. Head of the CDC Dr. Rochelle Walensky is sounding the alarm over a possible fourth surge in COVID-19 cases as health experts label Massachusetts among the “areas of greatest concern.” US & World Videos 1:56 20-year-old killed, teen critically hurt in Northbridge double stabbing 1:02 Bruins fans hyped after Game 7 OT win over Maple Leafs 0:33 Paperwork filed to charge student accused of school shooting threats in Milton 1:50 Man found shot to death in Taunton shed 0:49 Bowling alley reopens 6 months after mass shootings in Lewiston, Maine