Updated on May 4, 2021 at 8:27 am NBC Universal, Inc. Four of the seven mass COVID-19 vaccination sites in Massachusetts will close by the end of June as the state moves into the "next phase" of the vaccine distribution process. In a Monday press conference, Gov. Charlie Baker said the measure is part of a more "targeted" strategy focused on regional collaboratives, pharmacies and walk-up and mobile clinics that seeks to vaccinate more residents in disproportionately impacted communities. Download our mobile app for iOS or Android to get alerts for local breaking news and weather. The sites expected to close by the end of June are those at Gillette Stadium, the Hynes Convention Center, Natick Mall and Double Tree Hotel in Danvers. Baker said the closures are possible because the state is on track to reach its goal of vaccinating 4.1 million residents by June, calling it an "incredible achievement."