Update: Authorities have identified the victim as Gayle Johnson.
Investigators now believe a Route 110 bus hit a woman crossing Broadway shortly before 7 p.m., then dragged her down the street, the Suffolk County District Attorney's office reports:
Evidence developed through the night suggests that an MBTA bus struck the 52-year-old Revere woman who died in the area of 400 Broadway yesterday evening. He did not show signs of impairment; he was subjected to drug and alcohol testing pursuant to MBTA policy, the results of which must be subpoenaed by investigators. The driver, age 56, has not been charged at this time. The investigation remains active.