UPDATE: Leak stopped, roads being re-opened.
Boston firefighters are on Brookline Avenue near Beth Israel, where construction workers hit an 8-inch gas main.
Firefighters are evacuating nearby buildings, including on the Emmanuel College campus. Some Beth Israel personnel were evacuated as well, however, some patients and staff were allowed to stay inside, because portable meters showed no gas readings inside their buildings.
Police have shut the busy street on either side from Longwood Avenue to Park Drive.